Is there somewhere I can find instructions on how to use LEDES98?

I thought I'd be able to figure it out, with no problems... However, I thought wrong...

I believe I've set up everything correctly. I went to "Bills" then "Ledes 1998B Format Delivery"

I then clicked "Export" and I get an error message which reads: "Phase/Task does not contain the Litigation Task Billing Code".

I went through each and every time slip in the client I want to export; there do not appear to be any missing task codes... I'M LOST!!

Either I just really don't understand this, or I am missing something simple... Please help me... :)