Could not start executor. Unable to find an entry point named 'StartProcessUsingToken' in DLL 'UiPath.Session.dll'

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How to resolve could not start executor. Unable to find an entry point named 'StartProcessUsingToken' in DLL 'UiPath.Session.dll'

Issue Description:

When attempting to execute a Job on the Robot machine, the Robot fails with the below-specified error message.

Error Message:

Could not start executor. Unable to find an entry point named 'StartProcessUsingToken' in DLL 'UiPath.Session.dll'

Root Cause:

The error surfaces when the Robot attempts to call a new method, StartProcessUsingToken, on a .dll file where the method doesn't exist. This happens when residual UiPath.Session.dll from prior UiPath Studio installations are utilized by the UiPath Robot service.

Resolutions:

Approach #1:

Follow the steps below:

  1. Close All UiPath Processes: Terminate all running UiPath processes, including Studio and Robot.

  2. Stop UiPath Robot Service: Go to services (access it by typing services.msc in your search bar), find UiPath Robot, Select UiPath Robot and click stop.
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  3. Locate UiPath.Session.dll file: Navigate to the Studio installation directory ("C:\Program Files\UiPath\Studio") and search for the UiPath.Session.dll file.

  4. Remove the Oldest File: If there are multiple UiPath.Session.dll files present in the directory, delete the oldest one.
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Approach #2:

Should approach #1 not resolve the problem, a clean removal and reinstallation of UiPath Studio is recommended. Follow the steps in this KB Article - How to Perform A Clean Studio Reinstallation?


By following either of these approaches, you should be able to rectify the issues associated with residual UiPath.Session.dll from previous UiPath installations.