Malformed or corrupted AST file:......module file out of date

Malformed or corrupted AST file: 'Unable to load module "/Users/zhangyu/Library/Developer/Xcode/DerivedData/ModuleCache/11WVWISKX5HB9/Darwin.pcm": module file out of date'

After modifying system headers, please delete the module cache at '/Users/zhangyu/Library/Developer/Xcode/DerivedData/ModuleCache/11WVWISKX5HB9'

 

 

解决方法：clean project