Hello Gene,
There is another thread with the similar error: Issues While Installing Blue Prism Trial or Learning Edition 6.6 – EM > "System.NullReferenceException: Object reference not set to an instance of an object."
Question: Have you previously had Blue Prism setup and running on this computer?
Rationale for asking: This error has been reported a few times and up to now we've been unable to replicate to prevent it happening. It seems to occur when someone setups up Blue Prism Trial or Learning Edition, then removes some of it and attempts to install it again. The reason for my question is to understand whether you have received the error is a similar way to other people or there is something else causing the issue.
To resolve the issue, the following steps seems to have resolved for other people:
Completely remove Blue Prism from your system and install Blue Prism Trial or Learning Edition again:
If its previously worked, I suspect when you clear down and reinstall, everything should work again. I suspect that Microsoft SQL Server 2017 LocalDB thinks the Blue Prism instance and database is still there, but you have removed them from the file system.
It would be good for the community if you let us know how you get on. This will help the next person who sees this error.
Finally, with the imminent release of Blue Prism 6.7, we have made changes which we think will prevent this issue occurring in future. Namely, we've rewritten our code to enable the Blue Prism Trial or Learning Edition to be updated to the latest version.
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Chris Strong
Product Manager
Blue Prism
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