The iOS deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 14.4.99. (in target 'gRPC-C++' from project 'Pods')
# Instead of specifying a deployment target in pod post install, you can # delete the pod deployment target, which causes the deployment target to be # inherited from the podfile platform. In Xcode, navigate to Pods > Podfile and # add the code below: platform :ios, '12.0' post_install do |installer| installer.pods_project.targets.each do |target| target.build_configurations.each do |config| config.build_settings.delete 'IPHONEOS_DEPLOYMENT_TARGET' end end end