Error: Assign - 'Variant' from 'Sequence': Invalid Signature

When schedule run robot in Orchestrator, got the error message like below:


This situation happened before 1 time, and when I manually trigger in Orchestrator, no errors.
Does anyone know the root cause of this invalid signature error? Is this related to programming code or network connection or Orchestrator scheduler etc.? Kindly share your suggestions please. Thank you very much.

Sorry I didn’t attach the picture of assign step, hope it could be helpful for the possible root cause analysis.
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Could it be because of the .net expression (Directory.GetFiles(File_Path).Count)?

After changing the formula from Directory.GetFiles().Count to Directory.GetFiles().Length, no more error message. Maybe because of below:
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