Iphone - The executable was signed with invalid entitlements

I am trying to load an application on my iphone and this is the error I am receiving. Does anyone know how to fix this. I have searched the forums and S.O. and I cannot find the answer.

The entitlements specified开发者_如何转开发 in your application’s Code Signing Entitlements file do not match those specified in your provisioning profile.

Well....after a few hours I figured out the problem. I included the Entitlements.plist into my build setting and it worked. Now my question is why did it work once I included this???