Xcode build error from Firebase pod: error: no visible @interface for 'FIRAuth'

Question

I just pulled from a working version and cannot build my project due to what looks like a cocopods error

What I've Tried

• I followed this tutorial which usually seems to work and it did not work: Could not build Objective-C module 'Firebase'

Quit Xcode.
Delete project's temp files located at ~/Library/Developer/Xcode/DerivedData
Delete ProjectName.xcworkspace
Delete Podfile.lock file and Pods folder
Run pod install.
Open the newly created ProjectName.xcworkspace file and build.

I also udpated jsut the Firebase/Firestore pods with pod update Firebase/Firestore
cloud_firestore giving errors on IOS Simulator

• I also tried manually updating the Firebase pod version with pod 'Firebase/Core', '~>5.20.2'
  Then pod install This crashed during pod install.

• I also just tried pod update this did not resolve anything.

• I also cleaned by Xcode build folder and rebuild the project after updating the pods and still received the same error.

- (void)useEmulatorWithHost:(NSString *)host port:(NSInteger)port {
  [self.auth useEmulatorWithHost:host port:port];
  self.emulatorEnabled = YES;
}

Error:

error: no visible @interface for 'FIRAuth' declares the selector 'useEmulatorWithHost:port:'
  [self.auth useEmulatorWithHost:host port:port];
   ~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

Answer 1

• Delete Pods folder from Project by going into Folder explorer
• Clear Project in Xcode
• pod deintegrate
• pod init
• pod cache clean --all
• pod update