PyQt5 Designer is not working: This application failed to start because no Qt platform plugin could be initialized

Question

i have a problem with PyQt5 Designer. I install PyQt with -pip install PyQt5 and then -pip install PyQt5-tools everything OK. But when i try to run Designer it open messagebox with error: This application failed to start because no Qt platform plugin could be initialized? how to deal with it?

Answer 1

1. Go to => Python38>lib>site-packages>PyQt5>Qt>plugins
2. In plugins copy platform folder
3. After that go to Python38>lib>site-packages>PyQt5_tools>Qt>bin
4. paste folder here. Do copy and replace.

This will surely work.. Now you can use designer tool go and do some fun with python...

Answer 2

Try running it using command: pyqt5designer

It should set all the paths for libraries.

Works on Python 3.8, pyqt5-tool 5.15

Answer 3

I found a way of solving this:

Go to you python instalation folder Python38\Lib\site-packages\PyQt5\Qt\bin

Then copy all of that files to your clipboard and paste them at Python38\Lib\site-packages\pyqt5_tools\Qt\bin

Then open the designer.exe and it should work.