framework not found GoogleMapsCore Error
Finally a solution:
pod deintegrate
pod install
I had to reclone my Git project(because I had tried too many solutions to backtrack through new warnings and errors) then I just did the above commands in terminal.
For those using Ionic Framework,
Remove googlemap plugin and install again. It worked for me.
Though @Sam King's solution worked for me, I considered it as a hard fix without knowing the actual issue. The issue for my case was, I had accidentally deleted the GoogleMapsCore framework(Might be from 'Manage System Storage').
So, I just checked out an older version of my app and the issue got fixed.