Had the same issue in Pod v1.11.2. I tried restarting the simulator, erasing content, restarting the machine, removed derived data from File->WorkSpace settings -> {derived data}
Nothing worked for me. Finally, the below magic steps helped,
In the pod file replace 'use_frameworks!' with 'use_frameworks! :linkage => :static'
Run 'pod install' // now you might get some other issue
Revert 'use_frameworks! :linkage => :static' changes i.e replace 'use_frameworks! :linkage => :static' with 'use_frameworks!'
Again run 'pod install'
saravnandm
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