PROGRAM STOPPED: ERRORS DURING ELEMENT QUALITY CHECK?

I am attaching the saved hm file of the model. The model is Heat Sink and we need to perform thermal stress analysis on it and the mesh is tetra elements.

The amount of memory allocated for the run is 800 MB.
This run will use in-core processing in the solver.

Element # 53622, element type TETRA.

*** PROGRAM STOPPED: ERRORS DURING ELEMENT QUALITY CHECK.

I am getting this error continuously even though quality is clean. Can anyone identify what's the mistake and provide a solution?