When VuGen is launched it tries to read the persistence files located under the AppData folder. Some of those persistence files, hold the list of recent solutions and scripts, used in VuGen.
If some solution files are deleted (outside of VuGen), this process will not update the recent items list and therefore, when starting VuGen, it will try to locate those solutions that were deleted.
Since it fails to find them, then VuGen get the exception.
In order to solve this issue, follow the below steps:
• Close all VuGen instances
• Go to the Hewlett-Packard folder under AppData folder (“C:UsersAppDataRoamingHewlett-Packard")
• Rename or delete the “LoadRunner” folder
• Once it is done, launch VuGen again and see if the problem is solved
Note: This issue is already fixed in LR2020 SP1.