We will need more information to assist you. Assuming this in an error in your automation, we will need details on what your automation is doing at the time of the error. Please post a screenshot of your automation where this is occurring in addition to a screenshot of the error. Enabling the RuntimeLog will help you determine where the issue is occurring. To enable the RuntimeLog in Studio;
Select the Tools menu.
Select Pega Robotics.
Select Runtime Diagnostics.
Change the FilePublisher "Mode" to "On".
Select Log Categories.
Change "All Categories" to "Verbose".
Reproduce your issue and the log will be created in %AppData%\OpenSpan and will be called RuntimeLog.txt. If you would like to distill the log file down to only the Yellow and Blue lines in your automations (as well as any exceptions), you may use the bat file from the following post to create a simplified log file.