I work with Anaconda 5.3.0 and Python 3.7.
An application was made and I want to create an executable file with Pyinstaller, the case is that I miss the following error:

Exception: Cannot find existing PyQt5 plugin directories Paths
  checked:
  C:/Miniconda3/conda-bld/qt_1535195524645/_h_env/Library/plugins
In the anaconda command prompt try pip install PyQt5. It solved the issue for me.
Error with Pyinstaller & PyQt5 "Cannot find existing PyQt5 plugin directories"