My Game

Can anyone tell me why this doesnt work? It says object doesnt exist at a certain spot, i will capitalize the spot.

MAIN.bb

Graphics3D 800,800,900
SetBuffer FrontBuffer()
;=============
;CustomFunctions:
;Walk(unit,pointx,pointz,ID) id is usually 1
;AIwander(unit)
;AIflee(unit,attacker) unit to flee,attacker to flee from
;Kill(unit)
;AIattack(attacker,target)
;
;=============
;Models
;=============
zombieB3D = LoadMesh("zombie.b3d")
;=============
;Types
;=============
;Unit Type
Type unit
Field roll,yaw,pitch
Field r,g,b,a
Field maxhitpoints
Field UnitType$
Field ent
Field walkframe1
Field walkframe2
Field attackframe1
Field attackframe2
Field state
Field x,y,z
Field hitpoints
Field damage
Field attackcool,speed
End Type
;Hero Type
Type player
Field playername$
Field playernum
End Type
;Preset Zombie Unit
zombie.unit = New unit
zombie\r = 255
zombie\maxhitpoints = 25
zombie\hitpoints = 25
zombie\g = 255
zombie\unittype$ = "zombie"
zombie\ent = zombieB3D
zombie\b = 255
zombie\walkframe1 = 0
zombie\walkframe2 = 0
zombie\a = 0
zombie\attackframe1 = 0
zombie\attackframe2 = 0
zombie\state = 4
zombie\x = 0
zombie\y = 0
zombie\z = 0
zombie\damage = 5
zombie\speed = 0.6
zombie\attackcool = 2
;Player Unit
player1.unit = New unit
CopyUnit(zombie,player1)
player1\maxhitpoints = 50
player1\hitpoints = 50
player1\unittype$ = "player"
player1\damage = 10
player1\attackcool = 1
;===============
;Globals
;===============
Global FLEE = 0
Global DEAD = 1
Global DEFEND = 2
Global IDLE = 3
Global gravity = .5
;=======-
;Texturing
;=======-
;=============
;Includes and Variables that have to be placed after include
;=============
Include "functions1.bb"
Global a.unit
;=======-
;Monsters
;=======-
;Zombies
.FixAI
AI("zombie")
;=======-
;Player
;=======-
;=================
;Main Program Loop
;=================
light = CreateLight()
camera = CreateCamera()
CameraViewport camera,0,0,800,800
While True
PositionEntity zombie\ent,0,0,0
PositionEntity player1\ent,-15,0,-15
UpdateWorld
RenderWorld
Flip
Wend

functions1.bb


Function UpdateUnit(unitstype$)
For a.unit = Each unit
If a\unittype$ = unitstype$
a\x = EntityX(a\ent)
a\y = EntityY(a\ent)
a\z = EntityZ(a\ent)
EntityColor a\ent,a\r,a\g,a\b
EntityAlpha a\ent,a\a
a\roll = EntityRoll(a\ent)
a\yaw = EntityYaw(a\ent)
a\pitch = EntityPitch(a\ent)
EndIf
Next
End Function

Function Walk(walker.unit,x,z,ID)
pivot1 = CreatePivot()
PositionEntity pivot1,x,y,z
PointEntity walker\ent,pivot1
If ID = 1
While (EntityX(walker\ent) <= x) = False And (EntityZ(walker\ent) <= z) = False
MoveEntity walker\ent,walker\speed,0,walker\speed
Wend
EndIf
End Function
Function AIwander(wanderer.unit)
Walk(wanderer,Rand(EntityX(wanderer\ent),EntityX(wanderer\ent) + 10) + Rand(2,10),Rand(EntityZ(wanderer\ent),EntityZ(wanderer\ent)+ 10) + Rand(2,10),1)
End Function

Function AIflee(fleer.unit,attacker.unit)
Walk(fleer,EntityX(attacker\ent) - Rand(0,25),EntityZ(attacker\ent) - Rand(0,25),1)
End Function
Function Kill(entity.unit)
EntityAlpha entity\ent,0.1
Delay(200)
EntityAlpha entity\ent,0.2
Delay(200)
EntityAlpha entity\ent,0.3
Delay(200)
EntityAlpha entity\ent,0.4
Delay(200)
EntityAlpha entity\ent,0.5
Delay(200)
EntityAlpha entity\ent,0.6
Delay(200)
EntityAlpha entity\ent,0.7
Delay(200)
EntityAlpha entity\ent,0.8
Delay(200)
EntityAlpha entity\ent,0.9
Delay(200)
EntityAlpha entity\ent,1.0
Delay(200)
FreeEntity entity\ent
End Function
Function AIattack(unit.unit,target.unit)
WALK(UNIT,TARGET\X,TARGET\Z,1) ; HERE!
While Abs(unit\x - target\x) <= 10 And Abs(unit\z - target\z) <= 10
target\hitpoints = target\hitpoints - unit\damage
Delay(unit\attackcool * 1000)
Wend
End Function

Function AI(unittype$)
For a.unit = Each unit
If a\unittype$ = unittype$
If a\hitpoints < .25 * maxhitpoints
a\state = 0
EndIf
If a\hitpoints <= 0
a\state = 1
EndIf
Select a\state
Case 0
AIflee(a.unit,player1.unit)
Case 2
Kill(a)
Delete a
Case 4
AIwander(a)
End Select
AIattack(a,player1)
UpdateUnit(unitname$)
EndIf
Next
End Function


Function CopyUnit(unit1.unit,copied.unit)
copied\r = unit1\r
copied\maxhitpoints = unit1\hitpoints
copied\hitpoints = unit1\hitpoints
copied\g = unit1\g
copied\unittype$ = unit1\unittype$
copied\ent = unit1\ent
copied\b = unit1\b
copied\walkframe1 = unit1\walkframe1
copied\walkframe2 = unit1\walkframe2
copied\a = unit1\a
copied\attackframe1 = unit1\attackframe1
copied\attackframe2 = unit1\attackframe2
copied\state = unit1\state
copied\x = unit1\x
copied\y = unit1\y
copied\z = unit1\z
copied\damage = unit1\damage
copied\speed = unit1\speed
copied\attackcool = unit1\attackcool
End Function

The entity that doesn't exist is "Unit" I believe. Make sure that it is Global.

I have a quick suggestion for you. You may want to indent
and format your code. Instead of making it all one
vertical line, you can indent it... It makes looking for
errors a lot easier.

Here is an indented if statement:

If hi=1
    dothis()
EndIf 

Here is an indented nested if statement:

If hi=1
    If hihi=1
        dothis()
    EndIf
EndIf 

Take a look at your code indented. Isn't it a lot easier
to read? You will definitly find errors quicker.

Graphics3D 800,800,900 
SetBuffer FrontBuffer() 
;============= 
;CustomFunctions: 
;Walk(unit,pointx,pointz,ID) id is usually 1 
;AIwander(unit) 
;AIflee(unit,attacker) unit to flee,attacker to flee from 
;Kill(unit) 
;AIattack(attacker,target) 
; 
;============= 
;Models 
;============= 
zombieB3D = CreateCube()


;============= 
;Types 
;============= 
;Unit Type 
Type unit 
	Field roll,yaw,pitch 
	Field r,g,b,a 
	Field maxhitpoints 
	Field UnitType$ 
	Field ent 
	Field walkframe1 
	Field walkframe2 
	Field attackframe1 
	Field attackframe2 
	Field state 
	Field x,y,z 
	Field hitpoints 
	Field damage 
	Field attackcool,speed 
End Type 

;Hero Type 
Type player 
	Field playername$ 
	Field playernum 
End Type 



;Preset Zombie Unit 
zombie.unit = New unit 
  zombie\r = 255 
  zombie\maxhitpoints = 25 
  zombie\hitpoints = 25 
  zombie\g = 255 
  zombie\unittype$ = "zombie" 
  zombie\ent = zombieB3D 
  zombie\b = 255 
  zombie\walkframe1 = 0 
  zombie\walkframe2 = 0 
  zombie\a = 0 
  zombie\attackframe1 = 0 
  zombie\attackframe2 = 0 
  zombie\state = 4 
  zombie\x = 0 
  zombie\y = 0 
  zombie\z = 0 
  zombie\damage = 5 
  zombie\speed = 0.6 
  zombie\attackcool = 2 

;Player Unit 
player1.unit = New unit 
  CopyUnit(zombie,player1) 
  player1\maxhitpoints = 50 
  player1\hitpoints = 50 
  player1\unittype$ = "player" 
  player1\damage = 10 
  player1\attackcool = 1 


;=============== 
;Globals 
;=============== 
Global FLEE = 0 
Global DEAD = 1 
Global DEFEND = 2 
Global IDLE = 3 
Global gravity = .5 


;=======- 
;Texturing 
;=======- 
;============= 
;Includes and Variables that have to be placed after include 
;============= 
Global a.unit 


;=======- 
;Monsters 
;=======- 
;Zombies 
.FixAI 
  AI("zombie") 
;=======- 
;Player 
;=======- 
;================= 
;Main Program Loop 
;================= 
light = CreateLight() 
  camera = CreateCamera() 
  CameraViewport camera,0,0,800,800 



While True 
   PositionEntity zombie\ent,0,0,0 
	PositionEntity player1\ent,-15,0,-15 
	 UpdateWorld 
	RenderWorld 
   Flip 
Wend 






;
Function UpdateUnit(unitstype$) 
	For a.unit = Each unit 
		If a\unittype$ = unitstype$ 
			a\x = EntityX(a\ent) 
			a\y = EntityY(a\ent) 
			a\z = EntityZ(a\ent) 
			EntityColor a\ent,a\r,a\g,a\b 
			EntityAlpha a\ent,a\a 
			a\roll = EntityRoll(a\ent) 
			a\yaw = EntityYaw(a\ent) 
			a\pitch = EntityPitch(a\ent) 
		EndIf 
	Next 
End Function 

;
Function Walk(walker.unit,x,z,ID) 
	pivot1 = CreatePivot() 
	PositionEntity pivot1,x,y,z 
	PointEntity walker\ent,pivot1 
		If ID = 1 
			While (EntityX(walker\ent) <= x) = False And (EntityZ(walker\ent) <= z) = False 
				MoveEntity walker\ent,walker\speed,0,walker\speed 
			Wend 
		EndIf 
End Function 

;
Function AIwander(wanderer.unit) 
	Walk(wanderer,Rand(EntityX(wanderer\ent),EntityX(wanderer\ent) + 10) + Rand(2,10),Rand(EntityZ(wanderer\ent),EntityZ(wanderer\ent)+ 10) + Rand(2,10),1) 
End Function 

;
Function AIflee(fleer.unit,attacker.unit) 
	Walk(fleer,EntityX(attacker\ent) - Rand(0,25),EntityZ(attacker\ent) - Rand(0,25),1) 
End Function 

;
Function Kill(entity.unit) 
	EntityAlpha entity\ent,0.1 
	 Delay(200) 
	EntityAlpha entity\ent,0.2 
	 Delay(200) 
	EntityAlpha entity\ent,0.3 
	 Delay(200) 
	EntityAlpha entity\ent,0.4 
	 Delay(200) 
	EntityAlpha entity\ent,0.5 
	 Delay(200) 
	EntityAlpha entity\ent,0.6 
	 Delay(200) 
	EntityAlpha entity\ent,0.7 
	 Delay(200) 
	EntityAlpha entity\ent,0.8 
	 Delay(200) 
	EntityAlpha entity\ent,0.9 
	 Delay(200) 
	EntityAlpha entity\ent,1.0 
	 Delay(200) 
  FreeEntity entity\ent 
End Function 

;
Function AIattack(unit.unit,target.unit) 
	WALK(player1.UNIT,TARGET\X,TARGET\Z,1) ; HERE! 
		While Abs(unit\x - target\x) <= 10 And Abs(unit\z - target\z) <= 10 
			target\hitpoints = target\hitpoints - unit\damage 
			Delay(unit\attackcool * 1000) 
		Wend 
End Function 

;
Function AI(unittype$) 
	For a.unit = Each unit 
		If a\unittype$ = unittype$ 
			If a\hitpoints < .25 * maxhitpoints 
				a\state = 0 
			EndIf 
				If a\hitpoints <= 0 
					a\state = 1 
				EndIf 
					Select a\state 
						Case 0 
							AIflee(a.unit,player1.unit) 
						Case 2 
							Kill(a) 
							Delete a 
						Case 4 
							AIwander(a) 
					End Select 
			AIattack(a,player1) 
			UpdateUnit(unitname$) 
		EndIf 
	Next 
End Function 

;
Function CopyUnit(unit1.unit,copied.unit) 
	copied\r = unit1\r 
	copied\maxhitpoints = unit1\hitpoints 
	copied\hitpoints = unit1\hitpoints 
	copied\g = unit1\g 
	copied\unittype$ = unit1\unittype$ 
	copied\ent = unit1\ent 
	copied\b = unit1\b 
	copied\walkframe1 = unit1\walkframe1 
	copied\walkframe2 = unit1\walkframe2 
	copied\a = unit1\a 
	copied\attackframe1 = unit1\attackframe1 
	copied\attackframe2 = unit1\attackframe2 
	copied\state = unit1\state 
	copied\x = unit1\x 
	copied\y = unit1\y 
	copied\z = unit1\z 
	copied\damage = unit1\damage 
	copied\speed = unit1\speed 
	copied\attackcool = unit1\attackcool 
End Function 

track the error down by placing an end command at various positions, until you have located it clearly.

His code may be indented, but if you paste it here and don't use the code-tag, it will show like that.
Isn't that what the debugger is for?

To me it looks like the function AI passes the player1 instance to AIattack as "target", which tries to access its fields and passes that to walk. However, AI does not know player1, because it is not global. So it will just pass null to AIattack. That's no problem, but when you try to get TARGET\X, it will not work because null does not have "x".
Make player1 global and it should work.
Didn't test it though.

thx for help but about 50 more errors popped up im just going to rewrite it a different way

OK if you use "{codebox}" "{/codebox}" these posts will be smaller... where: "{" and "}" are really "[" and "]"
just FYI
RZ