[[XST]O_x]

It means that you don't have the variable "PlayerInfo" defined anywhere in your script, nor, it's defined in a local callback.

Also, you have another error that should be easily fixed by this:

pawn Код:

COMMAND:clearchat(playerid,params[])
{
   if( PlayerInfo[ playerid ][ pAdmin ] < 1 ) return SendClientMessage( playerid, COLOR_RED, "ERROR: You must be level 1 to use this command!" );
else
{
     for( new i = 0; i <= 100; i ++ ) SendClientMessageToAll( -1, "" );
}   return 1;
}