cython: Non-zero exit code (1): error: could not create 'build': 5

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I am receiving the the following warning when using the PyCharm debugger, my code is running very slowly in the debugger: "warning: Debugger speedups using cython not found. Run '"C:\Python33\python.exe" "C:\Program Files (x86)\JetBrains\PyCharm Community Edition 2016.1\helpers\pydev\setup_cython.py" build_ext --inplace' to build."

When I run this command I receive the following error:"Non-zero exit code (1): error: could not create 'build': 5"

Could anyone help me to understand why I cannot compile the Cython extension?

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Hi George! It's rather difficult to build Cython extensions on Windows, that's why we provide bundled binaries for Python versions 2.7, 3.4 and 3.5. The warning is mistakenly shown for your Python 3.3, here's bug in our bug tracker: https://youtrack.jetbrains.com/issue/PY-20598. If you want to use Cython speedups on Windows, please, use one of these interpreters.

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