When running an nunit action in FB 6, I have had this error.
Could not convert variant of type (Null) into type (String)
All of the test run successfully. I have found that if the unit tests contain [ignore] tests then you get this error. Having [ignore] test is bad practice, but still their is a bug in the action.
HI Russell,
This bug should be fixed in the latest official build, you can download it from:
URL: https://www.finalbuilder.com/download.aspx
Regards,
Paul.