I am testing my S&D map and I when the bomb is supposed to go off, this error comes having trouble loading "file maps/mp/gametypes/sd, line 1820". What is that??

Would it be possible for you to post a screen shot of the plant site in the editor and paste your .gsc in here?

Did you added a sd_bombtrigger to your map?

Here are screenshots of the plantsites:





here is the .gsc:

main()
{
maps\mp\_load::main();
game["allies"] = "american";
game["axis"] = "german";
game["attackers"] = "allies";
game["defenders"] = "axis";
game["american_soldiertype"] = "normandy";
game["german_soldiertype"] = "normandy";
ambientPlay("ambient_mp_bastogne");
maps\mp_Bastogne_fx::main();
thread garage1_rotate();
}

garage1_rotate()
{
	garage1 = getent("garage1", "targetname");
	trig = getent("garage1trigger", "targetname");

	while(1)
	{
		trig waittill("trigger");
		garage1 rotateroll(-100, 1.5, 0.7, 0.7);
		garage1 waittill("rotatedone");
		wait(6);
		garage1 rotateroll(100, 1.5, 0.7, 0.7);
		garage1 waittill("rotatedone");
	}


}

Yes, I do have a sd_bombtrigger in the map.

If you have any mods, take them out and see if it works.

For the sd gametype you need an additional script.
Create a second gsc file in the folder maps\mp and call it mp_yourmapname_fx.gsc
Put in the following:

main()
{
	precacheFX();
	ambientFX();
	level.scr_sound["flak88_explode"] = "flak88_explode";
}
precacheFX()
{
	level._effect["flak_explosion"] = loadfx ("fx/explosions/flak88_explosion.efx");
}

ambientFX()
{
}

This are the sound and the effect which will be played whan a bombside explodes.
Next add the following line above the line maps\mp\_load::main(); in your map gsc file
maps\mp\mp_yourmapname_fx::main();
This will call the new gsc file.
Now the sd gametype should work.

Thanks, problem solved.