Answers for "cocoapods could not find compatible versions for pod "qr_mobile_vision":"

CocoaPods could not find compatible versions for pod "ReactCommon/jscallinvoker"

// replace 

pod 'ReactCommon/jscallinvoker', :path => "../node_modules/react-native/ReactCommon"

//with

pod 'ReactCommon/callinvoker', :path => "../node_modules/react-native/ReactCommon"

cocoapods could not find compatible versions for pod cloud_firestore

# platform :ios, '9.0'
change to 

platform :ios, '10.0'