Nanda Veralla
Ansys Employee

Hello Alex,

When you can solve a new project without error and facing error with one particular file simply tells us that the issue is in the file, not with Ansys product. Reinstallation is not recommended in this case. 

Probably cleaning up this project or build it again from scratch should resolve.

Here's how you can clean the project from corruptions:

Corrupt ANSYS Mechanical Database? You Might Be Able to Recover - PADT (