Init.lua(101) attempted to call a nill value?

[werewolf0020]

Im getting this problem EVERY time i try to call this function

function RunFaster( ply )
ply:SetNWInt("SkillPoints", ply:GetNWInt("SkillPoints") - 1)
"You Now Have 1+ Sprint Speed "
ply:SetRunSpeed( 800 )
end

[MakeR]

That isn't valid Lua, which line (of the snippet you posted) is causing the error?

[blown25]

please use [LUA] tags next time and

[LUA]function RunFaster( ply )
ply:SetNWInt("SkillPoints", ply:GetNWInt("SkillPoints") - 1)
"You Now Have 1+ Sprint Speed " <--- WRONG
ply:SetRunSpeed( 800 )
end [/LUA]

should be:

[LUA]function RunFaster( ply )
ply:SetNWInt("SkillPoints", ply:GetNWInt("SkillPoints") - 1)
ply:ChatPrint("You Now Have 1+ Sprint Speed ") // or any other function.
ply:SetRunSpeed( 800 )
end [/LUA]

[sweeneypaul]

-snip
Ninja'd

[blown25]

[QUOTE=sweeneypaul;27566072]-snip[/QUOTE]

-snap-

ninja'd too.

[sweeneypaul]

I was just showing why he got the error not how to do it how he wants :P

[MakeR]

[QUOTE=sweeneypaul;27566115]I was just showing why he got the error not how to do it how he wants :P[/QUOTE]

That isn't what caused the error anyway, the error is obviously caused by a call to a nil value. The line you were talking about doesn't contain any calls.

[editline]21st January 2011[/editline]

[QUOTE=blown25;27566043]please use [LUA] tags next time[/QUOTE]

[noparse][lua]code[/lua][/noparse]

[Deuces]

[QUOTE=thejjokerr;27566471]Also do:
[lua]ply:SetNWInt("SkillPoints", ply:GetNWInt("SkillPoints", 0) - 1)[/lua]

Setting a default value in GetNWInt is smart if you're not sure if it has already been sent/set.[/QUOTE]

[werewolf0020]

it works now and i dont have to set the default value to 0 i alredy created

CFG_SkillPoints = 0

before that function

PD:Now how i prevent the player from buying the new ability if hes skillpoints arent 1?

becouse if i have 0 skillpoints and then use the function my skillpoints become -1

[MakeR]

Ue an if statement to check if the player has more than 0 skillpoints, something like this:

[lua]function RunFaster(ply)
local sp = ply:GetNWInt("SkillPoints", 0)
if sp > 0 then
ply:SetNWInt("SkillPoints", sp - 1)
ply:ChatPrint("You Now Have 1+ Sprint Speed")
ply:SetRunSpeed(800)
end
ply:ChatPrint("You don't have enough Skill Points")
end[/lua]

[ralle105]

The reason it errored as "tried to call a nil value" is because lua can pass a string as function parameter without parantesis, thus lua expected the call before the string (ply:SetNWInt) to return a function.
But as you'd expect is returns nil.
Just thought I'd clear up any likely confusion about this:smile:

[url=http://codepad.org/l79xvuhu]Example of a similiar non erroring code snippet showing what I just said[/url]