attachMovie head mess

I’m doing a standard attachMovie like so:
everything is linked properly, named properly, spelled properly, i’ve done it a million times before but all of a sudden i’ve got an error message saying:
Error Symbol=service, layer=Layer 1, frame=1:Line 1: The class or interface ‘service’ could not be loaded.
it’s doing my head in, i’ve tried everything i know. checked all the linkage properties, made sure the spelling is correct, export on the first frame etc etc. to be sure i’ve gone over and checked all the tutorials i could find and nothing mentions anything i havn’t done, wondering if some one out there might be able to give me a pointer? would be greatly appreciated