Door with trigger

[kolafresh]

still got this error ******* script runtime error *******
undefined is not an object: (file 'maps/mp/mp_door.gsc', line 7)
trig waittill ("trigger");
*
called from:
(file 'maps/mp/mp_4rooms.gsc', line 17)
maps\mp\mp_door::main();
*
started from:
(file 'maps/mp/mp_4rooms.gsc', line 1)
main()
* After i removed the thread door1();