Can not get Sheettab in the workfusion Inspector

I want to get sheettab in Excel 2016 using workfusion 2.4.2.
The command is :
Example: [CLASS:TabItem; NAME:SheetTab; TEXT:Sheet Tab ${sheet_name}]

Workfusion report following error message:
Caused by: org.openqa.selenium.WebDriverException: Element ‘[CLASS:TabItem; NAME:SheetTab; TEXT:工作表索引標籤 總表]’ doesn’t exist on the window ‘[HANDLE:394334]’ ‘[REGEXPTITLE:(?i).\Q109年度寬頻升速、300M及淨增績效統計表0922\E.]’. DesktopWindow

I can not get Sheettab in the workfusion Inspector.
Does anyone know how to figure it out ?thanks.