Unable to load platform at path

I have the same FileMerge warning in Git. When I look inside Xcode's preferences, I can see that neither the iPhoneSimulator nor the iPhoneOS platforms are installed but the directories do exist when I look into "/Applications/Xcode.app/Contents/Developer/Platforms".

I don't develop for iOS, so I deleted both iPhoneOS.platform and iPhoneSimulator.platform and the warning went away.

If you do need those platforms, try to reinstall them properly from Xcode.

And I tried converting iPhoneSimulator.platform/Info.plist from binary to xml, confirmed that Filemerge doesn't produce the error anymore. Then I converted it back to binary, and still, Filemerge is fine.

$ cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform
$ sudo plutil -convert xml1 Info.plist
$ sudo plutil -convert binary1 Info.plist

Disclaimer: inspired by @user3761183!

I tried converting all *.platform/Info.plist from binary to xml1 and it fixed the problem. Strange ...