Describe your issue
I have used companion yesterday without any problem. And have not changed anything in my project and companion. But it shows thus error
Download the official material font from Github.
Remove the line and promise to lift it
just clear the data of companion in your device app settings then restart companion.
Already did it. And uninstalled then installed again
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Then refresh builder site twice just to be sure( optional clear browser cache)and try it again it worked for me when i used this fonts 5 Free Blackletter, Gothic, Old German, Ancient Fonts · 1001 Fonts
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Make sure you have allowed Kodulars Companion to access your phone’s storage.
There’s your answer.
Sometimes even you allow Kodulars companion to access your phone storage
even by doing it manually by going to settings>app>kodular>permissions and still doesn’t work the companion app still gets that error . Even by restarting the companion. I dont know if its because of the device itself or the companion. 
Sometimes this error appears. Restart the emulator