[Natsheh]

Originally Posted by Rohanlogs Tsunami gave you a perfect answer but if you don't know what a client index is then show us the whole function and we can fix it for you. Also, this is the Sourcemod section, only SourcePawn is related here. That's one of AMXX core functions so I'm assuming that's Pawn language which should be posted in the AMXX scripting section.

You are on the wrong section.