MP3 Trigger with sansumbrella library not compiling

Hello,

I am working on an MP3 Trigger / Arduino project. I downloaded the sansumbrella MP3Trigger library. There is a compilation error when it comes to finding WProgram.h. I have tried this on PC and MAC. Both produce the same error, is there something wrong with the MP3Trigger lib and the current version of the arduino software?

Any help would be much appreciated,

Joe