Error Message With Social Security In Practice

[dunzz2001]

Hi Gurus.

How do I go about the error message below.
"APP-FF-33186:Failed to execute the formula NI_VALIDATION" "Please recompile NI_VALIDATION"
The Social Security Number I am using is not an authentic one, but one that I just assigned for the purpose of completing the simulation/practice. Your help is greatly appreciated.

Regards,

Dumi