My app was building fine in Xcode 6 Beta 4. I updated to Beta 5 today and ran into 2 errors:
The file “Storyboard_iPad-SBPartialInfo.plist” couldn’t be opened because there is no such file.
Command /Applications/Xcode6-Beta5.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/ibtool failed with exit code 255
What is that SBPartialInfo.plist? I could not search for it via spotlight. My Storyboard files are storyboard_iphone and storyboard_ipad
I was also experiencing the following error after upgrading to Beta5:
Command /Applications/Xcode6-Beta5.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/ibtool failed with exit code 255
As is often the case, quitting and reopening Xcode seems to have fixed the issue.
try to uncheck "Use Auto Layout" if it checked
I don't know if this will help -- but I had the same latter error (the one with the error code 255). What I did was run the simulator with iOS7 (that worked fine for me). Then when I was there, I reset the simulator, cleaned, and ran with iOS8. So you could try resetting the simulator, cleaning, and then building. After doing the above, my project ran fine on iOS8.
Xcode is having a problem compiling your storyboard, but the error is not particularly helpful.
I have seen this happen in a few occasions, but most often due to a Popover Segue with a missing or illegal anchor such as a UITableViewCell or an item in a cell's contentView.
So, check any recently added Segues.
来源：https://stackoverflow.com/questions/25127811/error-compiling-storyboard-files-using-xcode-6-beta-5