Quest in game

I'm new here, right now I could add item and play the game just fine.
But I have one major problem, why in-game my player cant accept quest. When the dialogue with the npc finish it should have given the player the quest but instead in the box the system said it was an invalid mission and the player wont get the quest? The player could talk to the npc a 100 time but still no quest in the quest book? :/:

One of the first questions that comes to my mind is, are you talking about one of the quests that are already in the game, or one you've made?

Either way you've been way too vague for anyone to answer your question (as I can also think of other questions that can be raised), so you may want to be more specific :wink:

Sorry, I'll be more specific on my problems:
For example, I'm the new player. When I created my character I go in-game. When I'm at the beginning map, I can't take any of the beginner quest (The quest is from Perfect World itself). I can see the quest though on the "Available Quest Tab" only that when I go to that specific NPC, I talk to him and after the quest dialogue the quest is not in my quest log or anything. And the system box on the left bottom corner says "INVALID MISSION". And on the "Available Quest Tab" the quest is still there but it's not showing on my Current Quest Tab.

Sincerely, thank you for your attention.

The first thing I would check/ask you is: does the tasks.data, task_npc.data match on your client and server? (if you use WinMerge it should show that they are physically the SAME exact file bit for bit byte for byte)...

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That's the first culprit I could see causing something like this to happen (possibly)...

Thank you for your help~