be sure to check your ENTIRE wdl file closely

you could have a loose { or ; someplace your not looking ( like a long empty space at the bottem with a { or ;

formatting your work helps to not only read it, but to find errors
here is your script above just as posted. I don;t readly see any formatting errors in it which is why it suggests you got other stuff in that wdl file then your posting

( i didn;t change a thing other than adjusted the formatting)
Code:

---

////////////////////////////////////////////////////////////////////////////////////

var video_mode = 7; // 800x600 pixels
var video_depth = 32; // 32 bit mode

////////////////////////////////////////////////////////////////////////////////////

string work10_wmb = "work10.wmb"; // define the string associated to the name of the level

////////////////////////////////////////////////////////////////////////////////////

function main()
{
	level_load (work10_wmb);
	while(1)
	{
		if(key_b)
		{
			camera.x = camera.x + 1;
		}
		wait(1);
	}
}

action rotate_plane
{
	var rotationstuff = 0;
	while(1)
	{
		if(key_cuu)
		{
			my.tilt += 1;
		}
		if(key_cud)
		{
			my.tilt -= 1;
		}
		if(key_cul)
		{
			my.pan += 1;
		}
		if(key_cur)
		{
			my.pan -= 1;
		}
		if(key_w)
		{
			c_move(my, vector(5,0,0), nullvector, glide);
		}
		if(key_s)
		{
			c_move(my, vector(-5,0,0), nullvector, glide);
		}
		if(key_a)
		{
			c_move(my, vector(0,5,0), nullvector, glide);
		}
		if(key_d)
		{
			c_move(my, vector(0,-5,0), nullvector, glide);
		}
	camera.pan = my.pan;
	camera.tilt = my.tilt;
	camera.x = my.x;
	camera.y = my.y;
	camera.z = my.z;
	wait(1);
	}
}

---