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I ran my iPhone app (not for the first time) and after checking every things function and being quite satisfied I quit the simulator. Than I added a period in my code, saved it, and ran it. The code didn’t compile so i took the period out and once again saved it and ran it. However it now gives me these 3 errors 
. I understand basically what it is saying however i do not know how to fix it.
Not sure how you got there, but your Precompiled Headers are invalid. Just force Xcode to recreate them.
Hold down the option key and select Clean Build Folder… from the Product menu.
Then try to build again.