CST - PIC ERROR

Hi!

I used CST's PIC solver for long runs and GPU acceleration has been used. But after calculating for a period of time, the software reported an error, that is :

"TDSolver: CST Exception abort: Type: Other failure. Msg: Failure: Error! "

The calculation also stopped after that. May I ask what is the reason for this error?

CST Studio Suite ​​​​​​​