If you're using Macbook with M1(apple silicon)

Inside your ios Folder follow these commands in terminal

 sudo arch -x86_64 gem install ffi  arch -x86_64 pod install  

If this still don't fix your issue then run

  arch -x86_64 pod install --repo-update  source : https://stackoverflow.com/questions/45796986/cocoapods-subspec-issue-none-of-your-spec-sources-contain-a-spec-satisfying-the/67803629#67803629 


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