I have the same issue. I thought it might have been related to a package update I did with homebrew or CocoaPods. Still trying to find a solution

In my case I needed to update homebrew 'brew update' Updated Ruby to a version >= 2.7.0 'brew install ruby' Homebrew Ruby to PATH. Find the directory with 'which ruby' and replace the file names to your .zshrc or ~/.bash_profile OR ~/.bashrc file. (export PATH="/usr/local/opt/ruby/bin:$PATH") Reload your SHELL config 'source ~/.bash_profile' Be sure to have the right gem 'sudo gem install cocoapods' I used 'gem update --system 3.5.1' Navigate to the ios/ directory and 'pod install' Move back to the root directory then run watchman watch-del-all rm -rf $TMPDIR/react-* npx react-native start --reset-cache