In the Web version, the browser console typically has logs that indicate data corruption within a particular section of the tax return, often a different section from where the error occurs. Deleting the data in just the bad section and filling it in again fixes the issue (e.g., re-entering a W2). Since it looks like you're using the desktop version, I wonder if you could find logfiles with this information, or perhaps if you run the desktop app from the terminal (cmd.exe), the errors will display there so you can re-do just the affected part of the return. Otherwise, just deleting the entire return and starting over will probably work, unless a different error comes up.
