If you are going to use iprintlnbold() on a player, you need to specify the player as the entity:
Code:
self iprintlnbold( "TEXT" );
Otherwise the server will throw a script runtime error because the game wont know what entity to use iprintlnbold() on (it has to be either a level entity of some sort, or a client entity).
Also, remember: when testing, the getGuid() method wont work on a Local/Listen server (it will always return 0). To return a client's real guid, it has to be tested on a dedicated server.