Whenever I try to set up firebase for iOS, all works fine until I add the 'cloud_firestore:' package (or any other FlutterFire package) into the pubspec.yaml folder. I get similar error messages each time. The only package firebase-related package that does not bring up an error is the firebase_core package. My most common error output is pasted below:

*Xcode's output: ↳ /Users/Jon/crud/ios/Pods/GoogleUtilities/GoogleUtilities/Network/GULNetw orkURLSession.m:55:3: warning: 'NSURLSession' is only available on iOS 7.0 or newer [-Wunguarded-availability] NSURLSession *__weak _Nullable _URLSession; ^ In module 'Foundation' imported from /Users/Jon/crud/ios/Pods/GoogleUtilities/GoogleUtilities/Network/GULNetw orkURLSession.m:15: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.pla tform/Developer/SDKs/iPhoneSimulator12.1.sdk/System/Library/Frameworks/F oundation.framework/Headers/NSURLSession.h:123:12: note: 'NSURLSession' has been explicitly marked partial here @interface NSURLSession : NSObject ^ In file included from /Users/Jon/crud/ios/Pods/GoogleUtilities/GoogleUtilities/Network/GULNetw orkURLSession.m:17: /Users/Jon/crud/ios/Pods/GoogleUtilities/GoogleUtilities/Network/Private /GULNetworkURLSession.h:33:12: note: annotate 'GULNetworkURLSession' with an availability attribute to silence this warning @interface GULNetworkURLSession : NSObject ^ 1 warning generated. /Users/Jon/crud/ios/Pods/FirebaseDatabase/Firebase/Database/Persistence/ FCachePolicy.m:17:9: fatal error: 'FCachePolicy.h' file not found #import "FCachePolicy.h" ^~~~~~~~~~~~~~~~ 1 error generated.*

I have attempted to make a new FCachePolicy.h folder using github references and copy that in but that just leads to an endless list of more Pods files being reported to me as not found. I am both very frustrated and lost for ideas at this point - any help or advice at this point would be greatly appreciated.