I just updated unity and rebuilt my project into a new Xcode project.
I made changes in game but when I try to append the new Xcode project I get 2 errors, one is a NullReferenceException without any log:
Error building Player: ArgumentNullException: Argument cannot be null.
Parameter name: key
and the second is:
ArgumentNullException: Argument cannot be null.
Parameter name: key
System.Collections.Generic.Dictionary`2[System.String,UnityEditor.iOS.Xcode.PBXBuildFile].set_Item (System.String key, UnityEditor.iOS.Xcode.PBXBuildFile value) (at /Users/builduser/buildslave/mono-runtime-and-classlibs/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:155)
I googled and it seems this bug has been around for some time now.
WORKAROUND:
build the project into a new folder, or use Replace instead of Append. Then copy the Data and Library folders from the new Xcode project to the old one. but the bug is still a pain in the neck. if anyone knows how to fix it please help.
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