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This error's causes and solutions are here. https://docs.unity3d.com/2021.2/Documentation/Manual/UpgradeGuide20212.html The reference way for...
I changed UnityEventDrawer to this code( #159 ) and now it works! Thanks! Unity 2019.4.17 -> 2020.3.7
My project had same error and I remove an aseet for solving it. This is just my guess. It need to set "Other Linker Flags" on XCode. I used this...