CocoaPods did not set the base configuration of your project because your project already has a custom config set

Question

I am following a tutorial (here is the link) that requires a custom config, and I think that effected my pod file, since I am getting this warning:

In order for CocoaPods integration to work at all, please either set the base configurations of the target iBuilt to Pods/Target Support Files/Pods-iBuilt/Pods-iBuilt.debug.xcconfig or include the Pods/Target Support Files/Pods-iBuilt/Pods-iBuilt.debug.xcconfig in your build configuration (iBuilt/Unity.xcconfig).

[!] CocoaPods did not set the base configuration of your project because your project already has a custom config set. In order for CocoaPods integration to work at all, please either set the base configurations of the target iBuilt to Pods/Target Support Files/Pods-iBuilt/Pods-iBuilt.release.xcconfig or include the Pods/Target Support Files/Pods-iBuilt/Pods-iBuilt.release.xcconfig in your build configuration (iBuilt/Unity.xcconfig).

I refered to these links: StackOverflow and Github for potential solutions, but none of those suggestions worked. So I need your help :)