error in decoration

[buzzy]

[I have 1 enemy, 1 weapon, 2 ammo types and 1 powerup in DECORATION]
I have the zDOom exe but when I test it, it says some error about the 2 ammo for my weapon has no parent, whats the problem?

Here are examples:
WEAPON -

Actor BuzzyLaser : BuzzyLaser 2009
{
Weapon.SelectionOrder 100
Inventory.PickupSound "misc/blpickup"
Inventory.Pickupmessage "You got the BUZZY LASER!"
Weapon.AmmoGive 30
Weapon.AmmoUse 15
AttackSound "weapons/blf"
States
{
Spawn:
BLSR A -1
Loop
Ready:
LASR A 1 A_WeaponReady
Loop
Deselect:
LASR A 1 A_Lower
Loop
Select:
LASR A 1 A_Raise
Loop
Fire:
LASR A 3
LASR A 0 A_FireBullets (13.4, 9.2, 50, 10, "BulletPuff")
LASR A 7 A_GunFlash
LASR B 7
LASR C 7 A_CheckReload
LASR D 7 A_OpenShotgun2
LASR E 7
LASR F 7 A_LoadShotgun2
LASR G 6
LASR H 6 A_CloseShotgun2
LASR A 5 A_ReFire
Goto Ready
Flash:
LASF A 6 A_FireBullets(10,10,15,30,0,1)
Stop
}
}

AMMO -
actor BuzzyLaserAmmo : Ammo 2100
{
inventory.pickupmessage "Picked up a small buzzy laser sphere."
inventory.amount 15
inventory.maxamount 310
inventory.icon "BLALA0"
ammo.backpackamount 30
ammo.backpackmaxamount 620
states
{
Spawn:
BLAS A -1
stop
}
}

actor LargeBuzzyLaserAmmo : BuzzyLaserAmmo 2101
{
inventory.pickupmessage "Picked up a large buzzy laser sphere."
inventory.amount 30
states
{
Spawn:
BLAL A -1
stop
}
}

POWER-UP
actor RapidFire : PowerupGiver 2103
{
spawnid 138
inventory.pickupmessage "Rapid Fire"
inventory.maxamount 0
inventory.PickupSound "misc/rpfp"
powerup.duration 35
powerup.type "WeaponLevel2"
+COUNTITEM
+INVENTORY.AUTOACTIVATE
+INVENTORY.ALWAYSPICKUP
states
{
Spawn:
RAPD A 6
RAPD B 6 bright
loop
}
}

And my enemy:
actor BuzzyMedic 269
{
spawnid 4
obituary "%o was killed by a buzzy medic."
health 120
radius 20
height 56
mass 100
speed 11
painchance 200
seesound "medic/sight"
attacksound "medic/attack"
painsound "medic/pain"
deathsound "medic/death"
activesound "medic/active"
dropitem
MONSTER
+FLOORCLIP
states
{
Spawn:
MDCB AB 10 A_Look
loop
See:
MDCB AABBCCDD 4 A_Chase
loop
Missile:
MDCB E 10 A_FaceTarget
MDCB F 8 A_PosAttack
MDCB E 8
goto See
Pain:
MDCB G 3
MDCB G 3 A_Pain
goto See
Death:
MDCB H 5
MDCB I 5 A_Scream
MDCB J 5 A_NoBlocking
MDCB K 5
MDCB L -1
stop
XDeath:
MDCB M 5
MDCB N 5 A_XScream
MDCB O 5 A_NoBlocking
MDCB PQRST 5
MDCB U -1
stop
Raise:
MDCB KJIH 5
goto See
}
}

Are they any errors in this DECORATE?

Anyway, the {powerup.type} thing, whats that type that make your weapons faster?

For your weapon, how do you include 3 powerup keys which link to my buzzy laser like on doom 64. One makes the buzzy laser shoots out still a single laser, second shoots out 2 and third shoots out 3.

How do I make my weapon EXACTLY like that one with 2 ammo packs with it (large pack) and (small pack). How, please someone tell me?