I really need help on this

I have a problem with imported sounds. Firstly, I import them, then through the sound editor I mark them "Use as Sound", and finally I make a trigger to play the sound. But as soon as I try to save/test the game, a chart with fatal errors pop up in the WE, and so it doesn't allow me to do anything with the imported stuff (sometimes this happens with models and skins too, but the sounds doesn't work all the time).
Could anyone help me, please? :\