Unfortunately I have the same problem with my Arduino Uno.I just received my
433Mhz RF transmitter and receiver pair but when I try to compile my sketch in the IDE it gives me a similar error. Even if I use the Examples! I think it's just the version of the
Virtual Wire library that is outdated for the current Arduino IDE. (I have the 1.0.3 version and the recent
Virtual Wire version is 1.5 which was written back in 2010 )

SO VIRTUAL LIBRARY DEVELOPER, PLEASE FIX THIS!!!

:0