You’re not providing specific enough info here for me (or anyone) to understand exactly what happened. Next time, take a screen shot of the error message. 
If you broke something project-specific, then uninstalling/reinstalling the software will make no difference–the project will still be broken.
But–
It really doesn’t matter. Uninstalling/reinstalling will work fine. Proceed in whatever way makes you most comfortable, and if you have any issues, come back here with specifics and we’ll try to help you fix them. 
The one thing I strongly recommend is that you go through the tutorial at least one time. (Help > Interactive Tutorial) You’ll learn the names of things in Scrivener, get an idea of the feature set, and undoubtedly save you some frustration with project navigation. My other recommendation is that you read the BACKUPS section of this post I wrote a while back for another user. It’s for v1 Scrivener, so some menu options may have changed, but the principles remain the same.
Best,
Jim