It doesn't matter what you call your fx, mp_mapname_fx is just the convention. We could maybe help better if you post the error. You will only get one error in the full console ( tilde + shift).

It would look something like:

************Script compile error********

blah di blah - error text here

*********************************

It might also say script runtime error instead of compile error. You need to post the bit up between the lines of asterisks. You'll need to run the map in developer mode (/developer 1 in console). Ignore the warnings and errors in yellow and red writing that appear in the console.