I now have another problem. I managed to resolve the issue by adding .old part, but now I believe there is some storage-related issue as a result of ansys not overwriting simulation results and instead saving everything on top, meaning I have no disk space (just my assumption).
What happens is when I run the simulation, I get the error as shown in the image in the middle of simulation. It appears that many students and professors have ran into similar issue but no clear solution has been proposed. I would appreciate any help. 
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