TAH server setup help


I did setup my basic TAH site. It also started serving requests to my t@h client, they uploaded and my slippy got running.
I need help in two problems please.

  1. my slippy has lots of white boxes. firebug shows “server error” but when i open that URL directly, it does show me the PNG. My tile server (a,b,c) is the same machine. please suggest why this may be happening
  2. how to i make z<12 tiles in this setup? (I have prepared a TRAPI server to get OSM data.) I don’t even know how to put a request for z<12 tiles and then how will my t@h clients render it?

please help,