I need a little help with a script :/

[amorinha]

Could someone help me please?
When I try to compile my lua it gives the following error:
stdin:1: attempt to index global 'client' (a nil value)
stack traceback:
stdin:1: in main chunk
[C]: at 0x7ff69f4e8960.
the line of code:
client.SetEventCallback("player_bind", function(key, action)

 

[feddyofc]

Is this made by ai or what