if i run on WED, a message box will appear and say that the <army_lights>(which is the name of my action that has its function on SED):Action not found

this is the simple code i made in SED:
//////////////////////////////////////////
BMAP* cursor_pcx = "mousebmp.pcx";

function highlight_event()
{
if (event_type == EVENT_CLICK)
my.ambient = 100;
my.lightrange = 200;
}
else if (event_type == EVENT_RELEASE)
{
my.ambient = 0;
my.lightrange = 0;
}
}

action army_lights()
{

my.emask = ENABLE_CLICK | ENABLE_RELEASE;
my.event = highlight_event;
}

function main()
{
//video_screen = ; // start in full screen mode
//screen_size.x = 500;
//screen_size.y = 400;
level_load ("asas.wmb"); // load the level
mouse_mode = 2; // show the mouse pointer
mouse_map = cursor_pcx; // set the mouse pointer bitmap

while (1)
{
mouse_pos.x = mouse_cursor.x; // allow the mouse pointer to move
mouse_pos.y = mouse_cursor.y; // on the x and y axis
wait (1);
}
}
/////////////////////////////////
is there something i missed to put into? or is there a problem in my code?