no such file or directory: 'Libraries/Plugins/

I have a mobile game that I have released on android and ios. I made some update for the android release (that had nothing to do with ads) and now I am trying to rebuild and release for ios.

I switched my project back over to ios, went to build and I am now getting the following error:

no such file or directory: 'Libraries/Plugins/iOS/GADUInterface.m'

I have shortened the name below for ease of reading. The file has to do with google ads, which were working fine last time I built for...

no such file or directory: 'Libraries/Plugins/