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 random.py, end.py - 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.