crash when copied Sources folder into project

[Keymo]

when i copied Sources folder into my project,there are 19 errors,like:
Cannot find interface declaration for 'NSObject', superclass of 'GRError'
Unknown type name 'NSOutputStream'
Property with 'retain (or strong)' attribute must be of object type
Unknown type name 'BOOL'
Unknown type name 'NSOutputStream'
...

can anyone help me

thanks too much

[aitbaali]

same crash, any solution?

[umigliore]

It's enough to add in GRError.h the row:
@import Foundation;

Same thing for #25