This document has not been formally reviewed for accuracy and is provided "as is" for your convenience.
Summary
The whole error string is "ExtractResultArg failure: object reference not set to an instance of an object".
Solution:
A hot fix is attached (LR2020GA.zip)for this issue. Please download & decompress it first, and then, put & replace the same_name file in "%LoadRunner%\bin" folder.
For more detail info, please see the external Document (ExtractResultArg failure Details.docx).