RPA CORE final assignment issue

I am getting this issue while sending email for my usecase.

Step name ‘send_email’ has failed. Reason: 'org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.gmail.com:465’Step name ‘send_email’ has failed. Reason: ‘org.apache.commons.mail.EmailException: Sending the email to the following server failed : smtp.gmail.com:465