Can someone help me?

[MeowZedong]

[ERROR] addons/tttdamagelogs-3.1.0/lua/damagelogs/client/init.lua:172: bad argument #1 to 'IsKeyDown' (number expected, got nil)
  1. IsKeyDown - [C]:-1
   2. Think - addons/tttdamagelogs-3.1.0/lua/damagelogs/client/init.lua:172
    3. fn - addons/tttdamagelogs-3.1.0/lua/damagelogs/client/init.lua:191
     4. unknown - addons/ulib/lua/ulib/shared/hook.lua:109

I dont know what I am doing with this lua...

[c👌de_g🎷]

The issue is probably an invalid enum/undefined variable being sent into input.IsKeyDown. Posting some code around the error line would help.

[Ricky Servietsky]

input.IsKeyDown need a key as parameter, a parameter is what you put inside the ( )
A list of key can be found here : KEY Enumerations
For exemple you could use
if input.IsKeyDown( KEY_E ) then
print("Hey, you pressed E !")
end
KEY_E is a 'constant' you can both use its name & numeric value,
for exemple the numeric value of KEY_E is 15 as you can see in the WIKI, so you can use :
if input.IsKeyDown( 15 ) then
print("Hey, you pressed E !")
end

Good luck,

[c👌de_g🎷]

You should always use the constant variable - enum values can change between updates and using constant numbers will break support from that.