firebase_storage pod error in flutter ios

I am uploading image to firebase. It is working fine on android, but in iOS there is a run time error and app crashes.

here is the code causing error:

appCheck = ComponentType<AppCheckInterop>.instance(for: AppCheckInterop.self,                                                   in: app.container)!

and the error is:

FirebaseStorage/Storage.swift:294: Fatal error: Unexpectedly found nil while unwrapping an Optional value

solution to upload image on firebase without app crash