Language please. Anyways; I'm afraid that this is not the place to ask for help about a different bot client. If you were to do this on powerbot you'd already have been banned. Try requesting help on their forums.
From my point of view it looks like it's stuck in some kind of while(true) loop when calling anything mouse-related.
Npc banker = Npcs.newQuery().names("Banker").results().nearest();
System.out.println(banker); //prints correctly
if(banker != null && banker.isValid()) {...