Nostalrius Begins - Quality wow vanilla realm (1.12)

so, i do all quest in "The Missing Diplomat" chaine, but can't finish the lust one (http://db.vanillagaming.org/?quest=1267)
i can't even take it, coz it looks like daily quest (blue marker)
i'll be very glad if u solve this problem

p.s. does administration read bug-trecker?