The tutorial says that you can use the dev_appserver.py helloworld/ in a project directive to test a project. When using it, this error occurs. How to fix it? 
- Try without a slash, or with a reverse `dev_appserver.py helloworld \`. This is the x-th slash, and you have Windows. - andy.37
- Thank you, but the error remains the same. - Dmitry Sviridenko
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