fatal error: malformed or corrupted AST file - Xcode

Question

Had same problem. Clearing derived data folder solved the issue for me. In Xcode, go to Window->Organizer->Projects, select your project, and press the "Delete..." button next to "Derived data".

If this doesn't work, you can try to do a Product->Clean (Cmd+Shift+k).

Press Command + shift + k or clean the project and then run project...

In Xcode select Product-->Clean problem will be solved

By default Library folder is hidden in Mac. Best way to navigate to that folder is :

1. Open Finder
2. Select Go from menu -> Select "Go to folder"
3. Type : /Users/"your user name"/Library/Developer/xcode

This will open direct xcode folder inside hidden library folder.

1. Select "DerivedData" folder
2. Command + A, select all and delete them.
3. Open Simulator and "Reset Content and Settings".

Now run XCode again, all will fix.

I had the same issue, solved it by cleaning the project.

Product-> Clean

or press

command+shift+K