This bug has been driving me nuts since I started using Xcode (4.6.3). Whenever I try to link a Storyboard item to my code, I get the error:
Could not
the following steps works for me hope that works for you also
1- You need to reopen you project after closing Xcode.
2- Wait for indexing project files
3- Check if it work or not
4- If still not working follow step 5, if not happy for you :)
5- Clean and Build your project target