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I have a post here with all the error messages: https://answers.unity.com/questions/1684663/icl2pp-not-building-correctly-for-androidil2cpp-no.html
2019.2.15 here, getting 3 super long errors, my game worked in mono, but after attempting to upload to play store and being told that it needs to...
So how exactly do you fix it? do you have to use a different version of unity or what? is it only broken on itch.ui?