I added Firebase libraries to my project, and then I got this error. When I compile it, Xcode can\'t find some directories. However, they are in the Pods directory.
I was facing same issue and I tried multiple things but still it was not working. I tried below.
Finally the thing that worked is, deleting pod file and re-creating pod file. It worked as magic!
P.S.: This is very generic error and so same solution may not work for all.