Help with custom monsters in Slade

I recently got into using slade and was attempting to make a custom enemy. no matter what I do it only appears as a missing texture in doombuilder although i am certain I have done everything correctly. I made it from scratch so i might have forgotten something? Here is my decorate code.

ACTOR GREYIMP 9973

{

Health 20

Radius 15

Height 50

Speed 10

Painchance 100

Mass 100

+FLOORCLIP

+DONTHURTSPECIES

Monster

SeeSound "........."

ActiveSound

PainSound

MeleeDamage 7

Obituary "%o was eaten by grey imp"

States

{

Spawn:

IMPY AB 5 A_Look

loop

 

See:

IMPY AABCC 1 A_Chase

loop

 

Melee:

IMPY D 1 A_FaceTarget

IMPY E 1 A_PlaySound("...")

IMPY F 1 A_FaceTarget

IMPY G 1 A_MeleeAttack

goto See

Pain:

IMPY H 5 A_Pain

goto See

Death:

IMPY I 0

IMPY J 0 A_Scream

IMPY KL 0

IMPY M 0 A_NoBlocking

stop

}

}