[antoaneu]

Change this line:

PHP код:

if(sscanf(params, "ui", id, text)) return SendClientMessage(playerid, -1, "USAGE: /settext [ID] [Text]"); 


To this line:

PHP код:

if(sscanf(params, "us[128]", id, text)) return SendClientMessage(playerid, -1, "USAGE: /settext [ID] [Text]"); 


The specifier 'i' means an integer, however here you want the player to type a text so the specifier will be 's'.