It seems that many people are having problems with Xcode 6 and Yosemite, but are reporting that the new version of Xcode is resolving the issues. Xcode 6.1 beta 2 just came out a couple of days ago, so maybe you should try it if you haven't already.
Uninstall the current version of Xcode, and it can also help to remove the AppleMobileDevice.kext file in /System/Library/Extensions , as well as the AppleMobileDeviceSupport.pkg in /Library/Receipts/ , and then download and use Xcode 6.1 beta 2
If you read a mistake, it is said that the path reads as nil, because he received these unusual characters גÄ-/גÄ . Track the cache files for this link and delete them.
source share