whats wrong here

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grimx

for some reason unknown too me i get ( object does not exist ) when i kill an enemy.
Please Help.
theres no media so you can copy and paste to see what i'm talkin about.
*********************************************
Type Player
Field x
Field y
End Type

Type Enemy
Field x
Field y
End Type

Type Bullet
Field x
Field y
End Type

SeedRnd MilliSecs()
Graphics 600,400
SetBuffer BackBuffer()

Global BulletTimer=MilliSecs()

create_player()
create_enemy()

While Not KeyHit(1)

update_player()
update_enemy()
update_bullet()
kills()

Flip
Cls
Wend
End

Function kills() ;NEEDS WORK... BAD REAL BAD
For e.enemy=Each enemy
For b.bullet=Each bullet
If RectsOverlap(e\x,e\y,10,10,b\x,b\y,10,10)
Delete e
End If
Next
Next
End Function

Function create_player()
p.Player=New Player
p\x=300
p\y=350
End Function
Function update_player()
For p.Player=Each Player
Color 100,100,100
Rect p\x,p\y,20,20
If KeyDown(203) p\x=p\x-2
If KeyDown(205) p\x=p\x+2
If KeyHit(57) And MilliSecs()>BulletTime Then Create_Bullet(p\x,p\y)
Next
End Function

Function create_enemy()
For i=1 To 5
e.Enemy=New Enemy
e\x=Rnd(10,500)
e\y=Rnd(10,100)
Next
End Function
Function update_enemy()
For e.Enemy=Each Enemy
Color 200,200,200
Rect e\x,e\y,10,10
Next
End Function

Function create_bullet(x,y)
b.Bullet=New Bullet
b\x=x+5
b\y=y-15
BulletTimer=MilliSecs()
End Function
Function update_bullet()
For b.Bullet=Each Bullet
Color 200,0,0
Rect b\x,b\y,10,10
b\y=b\y-3
If b\y<1 Then Delete b
Next
End Function