Make sure your hidden folders are displayed on your MAC address, Hold Option Key and click the Go button in the search menu.
Go to the next location -
Library / Application Support / Developer / Shared / Xcode / Plug -ins
Right-click on the plug-in and select to display package contents
Open the info.plist file and find DVTPlugInCompatibilityUUID and expand this section.
Press the + button and insert C4A681B0-4A26-480E-93EC-1218098B9AA0.
Save the file and restart Xcode.
No need to repeat for all plugins that are already installed in Xcode 6.
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