IDLE's subprocess didn't make connection

Seeking assistance! What’s the solution to this problem?

You can try to Delete all newely created .py files in the directory with Python. for example, - that was my problem that caused the same notification window. Reason in filename conflicts.

If it does not works for you then You can refer to this Stack overflow question , Hope that this will solve this issue.

Did you read and try out the suggestions in the linked IDLE doc section?
What have you tried?

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I deleted some files. Yes, it worked, thank you.