Get OCR Text 'AVL_AVView': Value cannot be null. (Parameter 'source')

Hi there,
I have a strange error during Get OCR Text ‘AVL_AVView’ activity. (I am using UiPath Document OCR engine.) But I already got the same error with different engines as well.
It works fine for a while (1-2-3 running) and after that I start getting this error:
“Get OCR Text ‘AVL_AVView’: Value cannot be null. (Parameter ‘source’)”
I have checked everything there and I could not see any source parameter.
After restarting the app and running the process again usually there is no error, again just for a while…
Unfortunately it cannot be used like this.
Do you have any idea what can be wrong, what to check, what to change?
Thank you very much for your help.

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