Monitor51:Loading ...70%,Stopped,Connect to target lost!!!

Monitor51:Loading ...70%,Stopped,Connect to target lost!!!

Anyone can tell me,why?
if I delete 2 files from the project,it works well,but once I add these 2 files,I can't debug it,like this:
Monitor51:Loading ...70%,Stopped,Connect to target lost!!!
Thank you!

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