Hello Yihong,Please ensure that you’ve saved the simulation file in a directory where you have write access. I would recommend moving the file to the Desktop and try rerunning the simulation. Please check this other post below to see if it helps and let me know if the problem still persists:https://forum.ansys.com/forums/topic/error-unable-to-locate-checkpoint-file-when-running-simple-fdtd-training-simmulation/
Thank you.
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