Error while executing script in studio

While executing groovy/custom script in local RPA Express I am getting below error.

10:59:29 [INFO] RoboticsFlowPlugin starts processing…
10:59:29 [INFO] SeleniumCapabilityPlugin starts processing…
10:59:29 [INFO] SeleniumCapabilityPlugin processor executed in 1ms.
10:59:29 [INFO] SeleniumCapabilityPlugin starts processing…
10:59:29 [INFO] SeleniumCapabilityPlugin processor executed in 0ms.
10:59:30 [INFO] RobotPlugin starts processing…
10:59:30 [INFO] SeleniumCapabilityPlugin starts processing…
10:59:30 [INFO] SeleniumCapabilityPlugin processor executed in 0ms.
10:59:30 [INFO] SeleniumCapabilityPlugin starts processing…
10:59:30 [INFO] SeleniumCapabilityPlugin processor executed in 0ms.
Apr 14, 2020 10:59:30 AM org.openqa.selenium.remote.ProtocolHandshake createSession
INFO: Detected dialect: OSS
10:59:30 [INFO] SeleniumCapabilityPlugin starts processing…
10:59:30 [INFO] SeleniumCapabilityPlugin processor executed in 0ms.
10:59:30 [INFO] SeleniumCapabilityPlugin starts processing…
10:59:30 [INFO] SeleniumCapabilityPlugin processor executed in 0ms.
10:59:30 [INFO] ScriptProcessor starts processing…
10:59:39 [WARN] [urn:uuid:A07A6BDD442BDA693915868421696263] robotics-flow plugin execution exception : org.webharvest.exception.ScriptException:
Config line 11: script block
org.openqa.selenium.remote.ScriptExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
org.webharvest.exception.PluginException: org.webharvest.exception.ScriptException:
Config line 11: script block
org.openqa.selenium.remote.ScriptExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at com.freedomoss.crowdcontrol.webharvest.plugin.selenium.RobotPlugin.executePlugin(RobotPlugin.java:185)
at org.webharvest.runtime.processors.WebHarvestPlugin.execute(WebHarvestPlugin.java:125)
at org.webharvest.runtime.processors.BaseProcessor.run(BaseProcessor.java:127)
at org.webharvest.runtime.processors.BodyProcessor.execute(BodyProcessor.java:27)
at org.webharvest.runtime.processors.WebHarvestPlugin.executeBody(WebHarvestPlugin.java:246)
at com.freedomoss.crowdcontrol.webharvest.plugin.selenium.RoboticsFlowPlugin.executePlugin(RoboticsFlowPlugin.java:110)
at org.webharvest.runtime.processors.WebHarvestPlugin.execute(WebHarvestPlugin.java:125)
at org.webharvest.runtime.processors.BaseProcessor.run(BaseProcessor.java:127)
at org.webharvest.runtime.Scraper.execute(Scraper.java:169)
at org.webharvest.runtime.Scraper.execute(Scraper.java:182)
at com.freedomoss.crowdcontrol.webharvest.executor.LocalWebharvestTaskExecutor.executeWebHarvestTask(LocalWebharvestTaskExecutor.java:173)
at com.workfusion.studio.launch.SingleThreadWebHarvestProcess.processTaskInputs(SingleThreadWebHarvestProcess.java:77)
at com.workfusion.studio.launch.SingleThreadWebHarvestProcess.start(SingleThreadWebHarvestProcess.java:46)
at com.workfusion.studio.launch.WebHarvestMainLauncher.launch(WebHarvestMainLauncher.java:108)
at com.workfusion.studio.launch.WebHarvestMainLauncher.main(WebHarvestMainLauncher.java:180)
Caused by: org.webharvest.exception.ScriptException:
Config line 11: script block
org.openqa.selenium.remote.ScriptExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at org.webharvest.runtime.scripting.GroovyScriptEngine.eval(GroovyScriptEngine.java:138)
at org.webharvest.runtime.processors.ScriptProcessor.execute(ScriptProcessor.java:74)
at org.webharvest.runtime.processors.BaseProcessor.run(BaseProcessor.java:127)
at org.webharvest.runtime.processors.BodyProcessor.execute(BodyProcessor.java:27)
at org.webharvest.runtime.processors.WebHarvestPlugin.executeBody(WebHarvestPlugin.java:246)
at com.freedomoss.crowdcontrol.webharvest.plugin.selenium.RobotPlugin.executePlugin(RobotPlugin.java:178)
… 14 more
Caused by: org.openqa.selenium.remote.ScriptExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at org.openqa.selenium.remote.RemoteWebDriver.getAsyncScriptExecutionResult(RemoteWebDriver.java:616)
at com.workfusion.rpa.helpers.Script.executeDesktopScript(Script.java:297)
at com.workfusion.rpa.helpers.Script.executeGroovyScript(Script.java:154)
at com.workfusion.rpa.helpers.Script$executeGroovyScript.callStatic(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallStatic(CallSiteArray.java:55)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:197)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:209)
at Script1.run(Script1.groovy:18)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:444)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:482)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:453)
at org.webharvest.runtime.scripting.GroovyScriptEngine.eval(GroovyScriptEngine.java:136)
… 19 more
Caused by: java.util.concurrent.ExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at org.openqa.selenium.remote.RemoteWebDriver.getAsyncScriptExecutionResult(RemoteWebDriver.java:614)
… 30 more
Caused by: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at org.openqa.selenium.remote.RemoteWebDriver.waitScriptCompletion(RemoteWebDriver.java:638)
at org.openqa.selenium.remote.RemoteWebDriver.lambda$getAsyncScriptExecutionResult$0(RemoteWebDriver.java:613)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
10:59:39 [ERROR] [urn:uuid:A07A6BDD442BDA693915868421696263] robotics-flow executePlugin exception: [nodeId=http://127.0.0.1:15410] org.webharvest.exception.ScriptException:
Config line 11: script block
org.openqa.selenium.remote.ScriptExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
org.webharvest.exception.PluginException: [urn:uuid:A07A6BDD442BDA693915868421696263] robotics-flow executePlugin exception: [nodeId=http://127.0.0.1:15410] org.webharvest.exception.ScriptException:
Config line 11: script block
org.openqa.selenium.remote.ScriptExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at com.freedomoss.crowdcontrol.webharvest.plugin.selenium.RoboticsFlowPlugin.executePlugin(RoboticsFlowPlugin.java:121)
at org.webharvest.runtime.processors.WebHarvestPlugin.execute(WebHarvestPlugin.java:125)
at org.webharvest.runtime.processors.BaseProcessor.run(BaseProcessor.java:127)
at org.webharvest.runtime.Scraper.execute(Scraper.java:169)
at org.webharvest.runtime.Scraper.execute(Scraper.java:182)
at com.freedomoss.crowdcontrol.webharvest.executor.LocalWebharvestTaskExecutor.executeWebHarvestTask(LocalWebharvestTaskExecutor.java:173)
at com.workfusion.studio.launch.SingleThreadWebHarvestProcess.processTaskInputs(SingleThreadWebHarvestProcess.java:77)
at com.workfusion.studio.launch.SingleThreadWebHarvestProcess.start(SingleThreadWebHarvestProcess.java:46)
at com.workfusion.studio.launch.WebHarvestMainLauncher.launch(WebHarvestMainLauncher.java:108)
at com.workfusion.studio.launch.WebHarvestMainLauncher.main(WebHarvestMainLauncher.java:180)
Caused by: org.webharvest.exception.PluginException: org.webharvest.exception.ScriptException:
Config line 11: script block
org.openqa.selenium.remote.ScriptExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at com.freedomoss.crowdcontrol.webharvest.plugin.selenium.RobotPlugin.executePlugin(RobotPlugin.java:185)
at org.webharvest.runtime.processors.WebHarvestPlugin.execute(WebHarvestPlugin.java:125)
at org.webharvest.runtime.processors.BaseProcessor.run(BaseProcessor.java:127)
at org.webharvest.runtime.processors.BodyProcessor.execute(BodyProcessor.java:27)
at org.webharvest.runtime.processors.WebHarvestPlugin.executeBody(WebHarvestPlugin.java:246)
at com.freedomoss.crowdcontrol.webharvest.plugin.selenium.RoboticsFlowPlugin.executePlugin(RoboticsFlowPlugin.java:110)
… 9 more
Caused by: org.webharvest.exception.ScriptException:
Config line 11: script block
org.openqa.selenium.remote.ScriptExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at org.webharvest.runtime.scripting.GroovyScriptEngine.eval(GroovyScriptEngine.java:138)
at org.webharvest.runtime.processors.ScriptProcessor.execute(ScriptProcessor.java:74)
at org.webharvest.runtime.processors.BaseProcessor.run(BaseProcessor.java:127)
at org.webharvest.runtime.processors.BodyProcessor.execute(BodyProcessor.java:27)
at org.webharvest.runtime.processors.WebHarvestPlugin.executeBody(WebHarvestPlugin.java:246)
at com.freedomoss.crowdcontrol.webharvest.plugin.selenium.RobotPlugin.executePlugin(RobotPlugin.java:178)
… 14 more
Caused by: org.openqa.selenium.remote.ScriptExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at org.openqa.selenium.remote.RemoteWebDriver.getAsyncScriptExecutionResult(RemoteWebDriver.java:616)
at com.workfusion.rpa.helpers.Script.executeDesktopScript(Script.java:297)
at com.workfusion.rpa.helpers.Script.executeGroovyScript(Script.java:154)
at com.workfusion.rpa.helpers.Script$executeGroovyScript.callStatic(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallStatic(CallSiteArray.java:55)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:197)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:209)
at Script1.run(Script1.groovy:18)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:444)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:482)
at groovy.lang.GroovyShell.evaluate(GroovyShell.java:453)
at org.webharvest.runtime.scripting.GroovyScriptEngine.eval(GroovyScriptEngine.java:136)
… 19 more
Caused by: java.util.concurrent.ExecutionException: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at org.openqa.selenium.remote.RemoteWebDriver.getAsyncScriptExecutionResult(RemoteWebDriver.java:614)
… 30 more
Caused by: org.openqa.selenium.remote.ScriptExecutionException: java.lang.NoClassDefFoundError: antlr/TokenStreamException
[java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]
at org.openqa.selenium.remote.RemoteWebDriver.waitScriptCompletion(RemoteWebDriver.java:638)
at org.openqa.selenium.remote.RemoteWebDriver.lambda$getAsyncScriptExecutionResult$0(RemoteWebDriver.java:613)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
10:59:39 [INFO] -------------------------------------------
10:59:39 [INFO] EXECUTION FAILED
10:59:39 [INFO] java.lang.NoClassDefFoundError: antlr/TokenStreamException [java.util.concurrent.FutureTask.report(FutureTask.java:122), java.util.concurrent.FutureTask.get(FutureTask.java:206), com.workfusion.autoit.driver.AutoItDriver.lambda$constructScriptExecutionTask$1(AutoItDriver.java:213), java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511), java.util.concurrent.FutureTask.run(FutureTask.java:266), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), java.lang.Thread.run(Thread.java:745)]

Kindly help me resolve this issue. Iam unable to execute any scripts