matplotlib import error

[cancom84]

[CRITICAL] [Window ] Unable to find any valuable Window provider. Please enable debug logging (e.g. add -d if running from the command line, or change the log level in the config) and re-run your app to identify potential causes
sdl2 - ImportError: DLL load failed while importing window_sdl2: The specified module could not be found.
File "C:\Users\tunguy\Anaconda3\lib\site-packages\kivy-2.0.0-py3.8-win-amd64.egg\kivy\core_init.py", line 58, in core_select_lib
mod = import(name='{2}.{0}.{1}'.format(
File "C:\Users\tunguy\Anaconda3\lib\site-packages\kivy-2.0.0-py3.8-win-amd64.egg\kivy\core\window\window_sdl2.py", line 27, in
from kivy.core.window._window_sdl2 import _WindowSDL2Storage

Traceback (most recent call last):
File "main.py", line 55, in
from es_gui.apps.data_manager.data_manager import DataManager
File "c:\work\quest\snl-quest\es_gui\apps\data_manager\data_manager.py", line 17, in
from es_gui.resources.widgets.common import LoadingModalView
File "c:\work\quest\snl-quest\es_gui\resources\widgets\common.py", line 11, in
mpl.use('module://kivy.garden.matplotlib.backend_kivy')
File "C:\Users\tunguy\Anaconda3\lib\site-packages\matplotlib_init_.py", line 1171, in use
plt.switch_backend(name)
File "C:\Users\tunguy\Anaconda3\lib\site-packages\matplotlib\pyplot.py", line 276, in switch_backend
class backend_mod(matplotlib.backend_bases.Backend):
File "C:\Users\tunguy\Anaconda3\lib\site-packages\matplotlib\pyplot.py", line 277, in backend_mod
locals().update(vars(importlib.import_module(backend_name)))
File "C:\Users\tunguy\Anaconda3\lib\importlib_init.py", line 127, in import_module
return _bootstrap.gcd_import(name[level:], package, level)
File "C:\Users\tunguy\Anaconda3\lib\site-packages\kivy-2.0.0-py3.8-win-amd64.egg\kivy\garden_init.py", line 180, in load_module
return self.load_module(fullname, moddir)
File "C:\Users\tunguy\Anaconda3\lib\site-packages\kivy-2.0.0-py3.8-win-amd64.egg\kivy\garden_init.py", line 183, in _load_module
mod = imp.load_module(fullname, None, moddir,
File "C:\Users\tunguy\Anaconda3\lib\imp.py", line 244, in load_module
return load_package(name, filename)
File "C:\Users\tunguy\Anaconda3\lib\imp.py", line 216, in load_package
return load(spec)
File "C:\work\quest\snl-quest\libs\garden\garden.matplotlib_init.py", line 1, in
from kivy.garden.matplotlib.backend_kivy import FigureCanvasKivy,
File "C:\work\quest\snl-quest\libs\garden\garden.matplotlib\backend_kivy.py", line 256, in
from matplotlib import _png
ImportError: cannot import name 'png' from 'matplotlib' (C:\Users\tunguy\Anaconda3\lib\site-packages\matplotlib_init.py)

[cancom84]

For now, please downgrade matplotlib to 3.1.3:
pip install matplotlib==3.1.3