The error message was "LUA ERROR: attempt to call a nil value".
It didn't tell what line, I took me hours trying to find the line.
Script 

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-----------------------------------
-----TANK MOD v0.1-----BY JELO-----
-----------------------------------
--Change damage
parse("mp_wpndmg rpglauncher 65")
parse("mp_wpndmg knife 0")
parse("mp_hud 64")
--Set variables
function initArray(m)
	local array = {}
	for i = 1, m do
		array[i]=0
	end
	return array
end
tankrot=initArray(32)
tankimg=initArray(32)
tankpic=initArray(32)
tankatk=initArray(32)
uphealth=initArray(32)
upspeed=initArray(32)
uprate=initArray(32)
special=initArray(32)
oldx=initArray(32)
oldy=initArray(32)
points=initArray(32)
rect=initArray(32)
round=initArray(32)
tri=initArray(32)
oct=initArray(32)
dual=initArray(32)
shape=initArray(32)
rects=initArray(32)
rounds=initArray(32)
duals=initArray(32)
tris=initArray(32)
octs=initArray(32)
leave=initArray(32)
alpha=initArray(32)
dead=initArray(32)
hud=initArray(32)
bar=initArray(32)
--Upgrade menu
function tank_upgrade(id)
	menu(id,"Upgrade Tank: 12 Points = Upgrade@b,Tank Health|Level "..uphealth[id].." / 5,Tank Speed|Level "..upspeed[id].." / 5,Firing Speed|Level "..uprate[id].." / 5")	
end
function tank_shop(id)
	menu(id,"Tank Shop@b,Rectangle Cannon|"..rect[id]..",Round Cannon|"..round[id]..",Triangle Cannon|"..tri[id]..",Octagon Cannon|"..oct[id]..",Dual Rocket|"..dual[id])
end
--Launch rocket on attack
addhook("attack","tank_attack")
function tank_attack(id)
	--Check if done reloading
	if tankatk[id]==1 then
		--Shoot rocket and reload
		timer(1500-uprate[id]*100,"tank_reload",tostring(id))
		parse("spawnprojectile "..id.." 47 "..player(id,"x").." "..player(id,"y").." 265 "..player(id,"rot"))
		tankatk[id]=0
	end
	--Remove other weapons
	if player(id,"weapon")~=50 then
		parse("strip "..id.." "..player(id,"weapon"))
		parse("equip "..id.." 50")
		parse("setweapon "..id.." 50")
	end
end
--Special Attack
addhook("attack2","tank_attack2")
function tank_attack2(id)
	--Check if done reloading
	if tankatk[id]==1 then
		--Shoot rocket and reload
		if special[id]==1 then
			timer(1500-uprate[id]*100,"tank_reload",tostring(id))
			parse("spawnprojectile "..id.." 47 "..player(id,"x").." "..player(id,"y").." 265 "..player(id,"rot")-1)
			parse("spawnprojectile "..id.." 47 "..player(id,"x").." "..player(id,"y").." 265 "..player(id,"rot")+1)
			special[id]=0
			dual[id]="2 Points"
			tankatk[id]=0
		end
	end
	--Remove other weapons
	if player(id,"weapon")~=50 then
		parse("strip "..id.." "..player(id,"weapon"))
		parse("equip "..id.." 50")
		parse("setweapon "..id.." 50")
	end
end
--Reload Rocket
function tank_reload(id)
	tankatk[tonumber(id)]=1
end
--Upgrade menu on F4, Shop on F3
addhook("serveraction","tank_serveraction")
function tank_serveraction(id,action)
	if action==2 then
		--Open menu
		tank_shop(id)
	elseif action==3 then
		--Open menu
		tank_upgrade(id)
	end
end
--Upgrade menu functions
addhook("menu","tank_menu")
function tank_menu(id,menu,sel)
	if (menu=="Upgrade Tank: 12 Points = Upgrade") then
		if (sel==1) then
			if points[id]>=12 and uphealth[id]<5 then
				points[id]=points[id]-12
				uphealth[id]=uphealth[id]+1
				msg2(id,"©000255000You have upgraded your tank!")
				parse("setmaxhealth "..id.." "..(100+uphealth[id]*10))
			elseif points[id]<12 then
				msg2(id,"©255000000You need 15 points to upgrade your tank!")
			else
				msg2(id,"©255000000It is already fully upgraded!")
			end
		elseif (sel==2) then
			if points[id]>=12 and upspeed[id]<5 then
				points[id]=points[id]-12
				upspeed[id]=upspeed[id]+1
				msg2(id,"©000255000You have upgraded your tank!")
				parse("speedmod "..id.." "..(-20+upspeed[id]))
			elseif points[id]<12 then
				msg2(id,"©255000000You need 15 points to upgrade your tank!")
			else
				msg2(id,"©255000000It is already fully upgraded!")
			end
		elseif (sel==3) then
			if points[id]>=12 and uprate[id]<5 then
				points[id]=points[id]-12
				uprate[id]=uprate[id]+1
				msg2(id,"©000255000You have upgraded your tank!")
			elseif points[id]<15 then
				msg2(id,"©255000000You need 15 points to upgrade your tank!")
			else
				msg2(id,"©255000000It is already fully upgraded!")
			end
		end
	elseif (menu=="Tank Shop") then
		if (sel==1) then
			if rect[id]=="Inactive" then
				if shape[id]==1 then
					round[id]="Inactive"
				elseif shape[id]==2 then
					tri[id]="Inactive"
				elseif shape[id]==3 then
					oct[id]="Inactive"
				end
				rect[id]="Active"
				shape[id]=0
				msg2(id,"©000255000You have changed your tank!")
			end
		elseif (sel==2) then
			if round[id]=="Inactive" then
				if shape[id]==0 then
					rect[id]="Inactive"
				elseif shape[id]==2 then
					tri[id]="Inactive"
				elseif shape[id]==3 then
					oct[id]="Inactive"
				end
				round[id]="Active"
				shape[id]=1
				msg2(id,"©000255000You have changed your tank!")
			elseif round[id]=="7 Points" then
				if points[id]>=7 then
					if shape[id]==0 then
						rect[id]="Inactive"
					elseif shape[id]==2 then
						tri[id]="Inactive"
					elseif shape[id]==3 then
						oct[id]="Inactive"
					end
					points[id]=points[id]-7
					round[id]="Active"
					shape[id]=1
					msg2(id,"©000255000You have changed your tank!")
				else
					msg2(id,"©255000000You need 7 points buy this tank!")
				end
			end
		elseif (sel==3) then
			if tri[id]=="Inactive" then
				if shape[id]==0 then
					rect[id]="Inactive"
				elseif shape[id]==1 then
					round[id]="Inactive"
				elseif shape[id]==3 then
					oct[id]="Inactive"
				end
				tri[id]="Active"
				shape[id]=2
				msg2(id,"©000255000You have changed your tank!")
			elseif tri[id]=="7 Points" then
				if points[id]>=7 then
					if shape[id]==0 then
						rect[id]="Inactive"
					elseif shape[id]==1 then
						round[id]="Inactive"
					elseif shape[id]==3 then
						oct[id]="Inactive"
					end
					points[id]=points[id]-7
					tri[id]="Active"
					shape[id]=2
					msg2(id,"©000255000You have changed your tank!")
				else
					msg2(id,"©255000000You need 7 points buy this tank!")
				end
			end
		elseif (sel==4) then
			if oct[id]=="Inactive" then
				if shape[id]==0 then
					rect[id]="Inactive"
				elseif shape[id]==1 then
					round[id]="Inactive"
				elseif shape[id]==2 then
					tri[id]="Inactive"
				end
				oct[id]="Active"
				shape[id]=3
				msg2(id,"©000255000You have changed your tank!")
			elseif oct[id]=="7 Points" then
				if points[id]>=7 then
					if shape[id]==0 then
						rect[id]="Inactive"
					elseif shape[id]==1 then
						round[id]="Inactive"
					elseif shape[id]==2 then
						tri[id]="Inactive"
					end
					points[id]=points[id]-7
					oct[id]="Active"
					shape[id]=3
					msg2(id,"©000255000You have changed your tank!")
				else
					msg2(id,"©255000000You need 7 points buy this tank!")
				end
			end
		elseif (sel==5) then
			if dual[id]=="2 Points" then
				if points[id]>=2 then
					points[id]=points[id]-2
					dual[id]="Ready"
					special[id]=1
					msg2(id,"©000255000Right-Click to launch the dual rocket!")
				else
					msg2(id,"©255000000You need 2 points buy the dual rocket!")
				end
			elseif dual[id]=="Ready" then
				msg2(id,"©000255000Right-Click to launch the dual rocket!")
			end
		end
	end
end
--Every 5 frames
addhook("ms100","tank_always")
function tank_always()
	--Get player IDs
	local playerlist=player(0,"table")
	for _,id in pairs(playerlist) do
		local x
		local y
		if player(id,"exists") then
			x=player(id,"x")
			y=player(id,"y")
		else
			x=-640
			y=-640
		end
		--Draw tank base
		freeimage(tankimg[id])
		if player(id,"team")==1 and player(id,"health")>0 then
			--Red if T
			tankimg[id]=image("gfx/JeloTanks/tbase.png",0,0,1)
		elseif player(id,"team")>=2 and player(id,"health")>0 then
			--Blue if CT
			tankimg[id]=image("gfx/JeloTanks/ctbase.png",0,0,1)
		end
		imagepos(tankimg[id],x,y,tankrot[id])
		--Draw tank cannon
		freeimage(tankpic[id])
		if player(id,"team")==1 and player(id,"health")>0 then
			--Red it T
			tankpic[id]=image("gfx/JeloTanks/tcannon_"..shape[id]..".png",0,0,1)
		elseif player(id,"team")>=2 and player(id,"health")>0 then
			--Blue if CT
			tankpic[id]=image("gfx/JeloTanks/ctcannon_"..shape[id]..".png",0,0,1)
		end
		imagepos(tankpic[id],x,y,player(id,"rot"))
		--Remove other weapons
		if player(id,"weapon")~=50 then
			parse("strip "..id.." "..player(id,"weapon"))
			parse("equip "..id.." 50")
			parse("setweapon "..id.." 50")
		end
		--Calculate base rotation
		if (oldx[id]>x and oldy[id]==y) or (oldx[id]<x and oldy[id]==y) then
			tankrot[id]=90
		elseif (oldx[id]==x and oldy[id]>y) or (oldx[id]==x and oldy[id]<y) then
			tankrot[id]=0
		elseif (oldx[id]<x and oldy[id]<y) or (oldx[id]>x and oldy[id]>y) then
			tankrot[id]=135
		elseif (oldx[id]>x and oldy[id]<y) or (oldx[id]<x and oldy[id]>y) then
			tankrot[id]=45
		end
		oldx[id]=x
		oldy[id]=y
		--Remove images at death
		if dead[id]==1 then
			imagealpha(tankimg[id],0)
			imagealpha(tankpic[id],0)
			freeimage(tankimg[id])
			freeimage(tankpic[id])
		end
		
	end
	--Remove images when leaving
	for i=1,32 do
		if player(i,"exists") then
			alpha[i]=1
		else
			alpha[i]=0
		end
		imagealpha(tankimg[i],alpha[i])
		imagealpha(tankpic[i],alpha[i])
	end
	--Check if living
	local playerlist=player(0,"tableliving")
	for _,pd in pairs(playerlist) do
		dead[pd]=0
	end
end
--HUD images
addhook("hit","tank_hit")
function tank_hit(id)
	freeimage(bar[id])
	bar[id]=image("gfx/JeloTanks/inbar.png",0,0,2,id)
	imagecolor(bar[id],math.min(0,((player(id,"maxhealth")*(255/player(id,"maxhealth")))-(player(id,"health")*(255/player(id,"maxhealth"))))),math.max(255,(player(id,"health")*(255/player(id,"maxhealth")))),0)
	imagealpha(bar[id],0.5)
	imagescale(bar[id],player(id,"health")/player(id,"maxhealth"),1)
	imagepos(bar[id],320-((player(id,"maxhealth")-player(id,"health"))*(318/player(id,"maxhealth"))),454,0)
end
--Check kill
addhook("kill","tank_kill")
function tank_kill(id,killer,victim)
	dead[victim]=0
	--Check if suicide
	if id~=victim then
		--Give tank points
		points[id]=points[id]+1
		parse('hudtxt2 '..id..' 1 "©255255255Tank Points: '..points[id]..'" 5 410 0')
	end
end
--Remove images when dead
addhook("die","tank_die")
function tank_die(id)
	dead[id]=1
end
--Values set on spawn
addhook("spawn","tank_spawn")
function tank_spawn(id)
	dead[id]=0
	tankatk[id]=1
	tankrot[id]=math.random(0,3)*45
	parse("setmaxhealth "..id.." "..(100+uphealth[id]*10))
	parse("speedmod "..id.." "..(-20+upspeed[id]))
	--HUD images
	freeimage(bar[id])
	bar[id]=image("gfx/JeloTanks/inbar.png",0,0,2,id)
	imagecolor(bar[id],math.min(0,((player(id,"maxhealth")*(255/player(id,"maxhealth")))-(player(id,"health")*(255/player(id,"maxhealth"))))),math.max(255,(player(id,"health")*(255/player(id,"maxhealth")))),0)
	imagealpha(bar[id],0.5)
	imagescale(bar[id],player(id,"health")/player(id,"maxhealth"),1)
	imagepos(bar[id],320-((player(id,"maxhealth")-player(id,"health"))*(318/player(id,"maxhealth"))),454,0)
end
--No dropping
addhook("drop","tank_drop")
function tank_drop(id,x,y)
	return 1
end
--No buying
addhook("buy","tank_buy")
function tank_drop(id,x,y)
	return 1
end
--No collecting
addhook("walkover","tank_walkover")
function tank_walkover(id,iid,type)
	--Collect medikits, money, etc.
	if (type>=61 and type<=68) then
		return 0
	--Collect flags
	elseif (type>=70 and type<=71) then
		return 0
	end
	--Don't collect other weapons
	return 1
end
addhook("join","tank_join")
function tank_join(id)
	--HUD images
	freeimage(hud[id])
	hud[id]=image("gfx/JeloTanks/bar.png",0,0,2,id)
	imagealpha(hud[id],0.8)
	imagepos(hud[id],320,454,0)
	freeimage(bar[id])
	--IT'S ALIVE!!! MUHAHAHAHAHA!!!!!
	alpha[id]=1
	--Load data
	tank_load(id)
end
--Player leaves server
addhook("leave","tank_leave")
function tank_leave(id)
	alpha[id]=0
	--Save data
	tank_save(id)
end
--Save data
function tank_save(id)
	if rect[id]=="Active" then rects[id]=0 else rects[id]=1 end
	if round[id]=="Active" then rounds[id]=0 elseif round[id]=="Inactive" then rounds[id]=1 else rounds[id]=2 end
	if tri[id]=="Active" then tris[id]=0 elseif tri[id]=="Inactive" then tris[id]=1 else tris[id]=2 end
	if oct[id]=="Active" then octs[id]=0 elseif oct[id]=="Inactive" then octs[id]=1 else octs[id]=2 end
	if duals[id]=="Ready" then duals[id]=0 else duals[id]=1 end
	if (player(id,"exists")) and (player(id,"usgn")>0) then
		f=assert(io.open("sys/lua/JeloTanks/Save Data/"..player(id,"usgn")..".sav","w"))
		f:write(uphealth[id].." "..upspeed[id].." "..uprate[id].." "..points[id].." "..rects[id].." "..rounds[id].." "..tris[id].." "..octs[id].." "..duals[id].." "..special[id].." "..shape[id])
		f:close()
	end
end
function ToTable(t,match)
	local cmd = {}
	if not match then
		match = "[^%s]+"
	else
		match = "[^"..match.."]+"
	end
	for word in string.gmatch(t,match) do
		table.insert(cmd,word)
	end
	return cmd
end
--Load data
function tank_load(id)
	local linya
	if (player(id,"usgn")>0) then
		f=io.open("sys/lua/JeloTanks/Save Data/"..player(id,"usgn")..".sav","r")
		if (f~=nil) then
			for line in f:lines() do
				linya=ToTable(line)
				uphealth[id]=tonumber(linya[1])
				upspeed[id]=tonumber(linya[2])
				uprate[id]=tonumber(linya[3])
				points[id]=tonumber(linya[4])
				rects[id]=tonumber(linya[5])
				rounds[id]=tonumber(linya[6])
				tris[id]=tonumber(linya[7])
				octs[id]=tonumber(linya[8])
				duals[id]=tonumber(linya[9])
				special[id]=tonumber(linya[10])
				shape[id]=tonumber(linya[11])
				if rects[id]==0 then
					rect[id]="Active"
				else
					rect[id]="Inactive"
				end
				if rounds[id]==0 then
					round[id]="Active"
				elseif rounds[id]==1 then
					round[id]="Inactive"
				else
					round[id]="7 Points"
				end
				if tris[id]==0 then
					tri[id]="Active"
				elseif tris[id]==1 then
					tri[id]="Inactive"
				else
					tri[id]="7 Points"
				end
				if octs[id]==0 then
					oct[id]="Active"
				elseif octs[id]==1 then
					oct[id]="Inactive"
				else
					oct[id]="7 Points"
				end
				if duals[id]==0 then
					dual[id]="Ready"
				else
					dual[id]="2 Points"
				end
				if uphealth[id]==nil then
					uphealth[id]=0
				end
				if upspeed[id]==nil then
					upspeed[id]=0
				end
				if uprate[id]==nil then
					uprate[id]=0
				end
				if points[id]==nil then
					points[id]=0
				end
				if rect[id]==nil then
					rect[id]="Active"
				end
				if round[id]==nil then
					round[id]="7 Points"
				end
				if tri[id]==nil then
					tri[id]="7 Points"
				end
				if oct[id]==nil then
					oct[id]="7 Points"
				end
				if dual[id]==nil then
					dual[id]="2 Points"
				end
				if special[id]==nil then
					special[id]=0
				end
				if shape[id]==nil then
					shape[id]=0
				end
				break
			end
			f:close()
		end
	end
	--HUD text
	parse('hudtxt2 '..id..' 1 "©255255255Tank Points: '..points[id]..'" 5 410 0')
	parse('hudtxt2 '..id..' 2 "©000255255[F3] Tank Shop | [F4] Upgrade Tank" 5 423 0')
	parse('hudtxt2 '..id..' 3 "©255255000Script by OEM/Jelo" 519 410 0')
	parse('hudtxt2 '..id..' 4 "©255255000(USGN=70513)" 543 423 0')
end
Can't find "nil" variable
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