ummm I only have a .wmp date of the map

This is the code by now:
#include <acknex.h>
#include <default.c>
function_main()
{
level_load("Level.wmp");
wait(1);
}

I have put all level files into one folder and when I start the .exe I get following Error Message:

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Compiling testscript.WDL - [Esc] to abort....
< function_main() {>
testscript.wdl 4:0 ():Parameter unknown function_main bad keyword in {}

Can´t run testscript.wdl
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Something wrong at level_load???