Error: While importing ‘run_app_dev‘, an ImportError was raised.

Problem description

Running a python flash project on a new machine causes the following problems:
error: while importing 'run_ app_ dev', an ImportError was raised.


It is said on the Internet that it is a circular call problem, but this project can run on my laptop. I doubt whether it is the version of flash, because I directly installed the latest Flash. After uninstalling the latest flash, I installed 1.1.2 flash. This problem is solved

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