When using filemerge to solve HG conflict, I got the following error
FileMerge[18002:707] Unable to load platform at path
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform
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 ...
i face the same problem following command solved my problem:
sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer/
There is a simple solution to this issue that worked for me. I merely started up Xcode and created an iOS playground project. Xcode asked me to enable developer mode on the Mac, which I did. I then closed Xcode, deleted the project and the filemerge error was no more.
Running Xcode version 6.2
来源：https://stackoverflow.com/questions/12617644/unable-to-load-platform-at-path