Game not exporting as APK file

I have a finished project for android, but when i export it what happens is:
1-takes 1 hour to export;
2-just shows “something went wrong :(”;
3-when i open log file, just says “no cordova platform added, please use ‘cordova platform add (platform)’”.

NOTE:Just in case it matters, i use Ubuntu 20.04, GDevelop 5.0.0-beta110 and the game file is 57.4 Mb.

Are you trying to do the online Android export?
Did you fill the fields in the Game Settings/Properties window?