aurduino duo with eth shield loading wav files using TMRpcm

yeah looks like alot, ive removed them still has the same error C:\Users\mark\Desktop\sketch_apr18a\sketch_apr18a.ino:44:27: warning: ISO C++ forbids converting a string constant to 'char*' [-Wwrite-strings]

{audio.play("wheel.wav");} //Play WHEEL

still seems like the TMRpcm library doesn't like my syntax, anyone got this working?