Error Message on install

[Nelenarap]

When trying to install DarqUI on my wife's machine, I'm getting an "Object not set to an instance of an object." error message.

I know that's one of the vaguest error messages in the history of error messages, but I have no clue how to troubleshoot it any further. I tried logging each character in to make sure they weren't in an expired Inn Room instance or something and I also rebuild the logincache folder.

Any ideas?