Any solution, beside Xcode 12.2 from apple store, seems not to work, still saying missing plugins but not able to track the report in console, (this one crash when starting Xcode)
pplication Specific Information:
dyld3 mode Terminating app due to uncaught exception 'NSRangeException', reason: '* -[_NSArrayM insertObject:atIndex:]: index 4 beyond bounds [0 .. 2]'
terminating with uncaught exception of type NSException
abort() called
Application Specific Backtrace 1:
0 CoreFoundation 0x00000001878e7104 exceptionPreprocess + 240
1 libobjc.A.dylib 0x00000001c67ea5b8 objcexceptionthrow + 60
2 CoreFoundation 0x00000001879a79f0 -[NSCFString characterAtIndex:].cold.1 + 0
3 CoreFoundation 0x0000000187809068 -[NSArrayM insertObject:atIndex:] + 1080
4 AppKit 0x0000000184a25d00 -[NSSplitView(NSSplitViewArrangedSubviews) insertArrangedSubview:atIndex:] + 528
5 AppKit 0x00000001849d1528 -[NSSplitViewController updateSplitView:withBlock:] + 68
6 AppKit 0x0000000184b972f8 -[NSSplitViewController insertArrangedView:atIndex:] + 172
7 AppKit 0x0000000184b97234 -[NSSplitViewController insertWrapperViewIntoSplitViewForSplitViewItem:atIndex:] + 104
MrFVD
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I am having the same problem.
something happens in my DTK that Xcode also doesn't start :(