Error - Unhandled exception. Does anyone else get this?

The clue is in the message. It appears that your NT user folder has fallen on OneDrive. I’m guessing you’re on Windows 11 and Microsoft in their infinite wisdom have decided to put your user profile on OneDrive. If you don’t use OneDrive, get rid of it completely.

Otherwise, you’ll need to disentangle NT from OneDrive and make sure your NT user folder (not installation folder) goes on your local hard drive at this location: C:\Users\YOUR_USERNAME\Documents\NinjaTrader 8

I don’t know how to do this, but I’ve seen a few of my users run into this issue and they managed to figure out how to point NT to the local hard drive. You may need to rerun the NT installation process and point your user folder to the local hard drive folder.