We could go through a lot of steps to find the corrupt file and replace it but the easiest thing is to just reinstall BeerSmith.
Backup your ...documents/BeerSmith3 folder. Download and reinstall BeerSmith from the BeerSmith.com website.
After opening and letting your new copy register itself, close BeerSmith and just replace the documents/BeerSmith folder with your backup. When you open BeerSmith, all of your recipes and profiles will be restored, plus the reports should be fine.