CocoaPods could not find compatible versions for pod EXConstants code example

Example 1: cocoapods could not find compatible versions for pod cloud_firestore

# platform :ios, '9.0'
change to 

platform :ios, '10.0'

Example 2: CocoaPods could not find compatible versions for pod "EXFileSystem

#go to /ios and open  podfile 

the top of file 

platform :ios, '14.4.2'

'14.4.2' is the lastest verison