Sanctum quests aren't working- it's failing resulting to error

i tried to complete my quest (OATH TAKING & LUCKY DAY) in sanctum (quest came from DIMODICOS and JUCLEUS) and as soon as i submit it there's an error that pops out on the quest page (sad to say i didn't get a screenshot of it) and it happen to the other players in my shop as well. Please take a look for possible fix on this. We can't have an expansion of our cubes if the LUCKY DAY quest won't get fixed (ELYOS QUEST FOR CUBE EXPANSION). :crying: