fatal error: malformed or corrupted AST file - Xcode

Question

I get this error when building my app in the latest version of Xcode:

fatal error: malformed or corrupted AST file: \'Unable to load module \"/Users

Answer 1

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).

Answer 2

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.

Answer 3

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

Product-> Clean

or press

command+shift+K

Answer 4

Got this error while trying to build a third-party app for the first time. Adding foundation as a library fixed the issue for me.

Answer 5

tried to re-install XCode which didnt resolve the issue, also created a new local user account & get the same error so in the end I gave up & restored to a time machine backup from a few days before... seems to be ok again... for now!

Answer 6

Simply clean remove the Derived Data and build folders. The problem shall be resolved.