So I go back to the vampire castle after completing the quest for
the Bloodstone Chalice, After talking to the guy I talked to at the beginning of
the quest, he says that "Lord Harkon wants to speak to me"
So after he says that it says the Bloodstone Chalice quest was completed,
I go into Harkon's room to see him and out of all the things I can talk to him about,
it won't show anything that has to do with the next quest.
I've finished the entire Dawnguard quest as a vampire lord before a while ago, I just felt like
starting a new character. So yea, I don't have the option to speak to Harkon about the
quest like I should and this is the 2nd bug I've ran into in the game.
Can anyone PLEASE tell me how to fix this?
If I have to uninstall and reinstall the DLC on my ps3, please tell me how I do that.
Is there any way to get rid of this bug and still have my character and all my stuff?
I'd hate having to start all over on this add-on AGAIN for the 3rd time.

Try a reload.

I have and nothing will change. Maybe uninstalling and reinstalling the add-on will?
Idk, is that even possible on ps3? I have no idea how to do that and if it will delete all my stuff that's part of the
Add-on. Also, I should mention another bug in the game on another save file. Same problem, but different quest.
On my other file, I'm on the quest where I have to take down the Moth Priest and use vampire seduction on him,
But the vampire seduction won't work! I got the Moth priest down, using my vampire seduction and nothing happens..
He just stays on his knees, so I can't go on with that quest.

1) when you go to return Serana to the castle, did you by any chance had discovered the castle before this quest? if so, did you by any chance used fast travel to the castle? if yes, load an earlier save and do NOT use fast travel.

If you went there normally and didnt had the castle discovered yet, you can try this: load an earlier save, travel to any portside town (solitude, dawnstar or windhelm) and go to the docks, where youll find someone sitting nearby a boat, talk to the npc and ask them to rent a boat, and for destination choose "a little island on the sea between skyrim and high rock" or something along these lines. the npc will tell you they wont go to the island per se but will take you near by there. It will take you to the abandoned boat on the coast of skyrim "Floatwater Jetty" or something it was called, and in there use the boat to get the island, and once there, walk to the gate until Serana starts the dialogue with you.. also be sure to let her finish any idle talk she will tell you once you get to the island, but do not talk to her while at it

If even this fails this, only then try reinstalling the dlc...just ask once you tried this.

2)as for the moth priest, once you enter that cave he is being held in, make sure he has spawn inside the barrier as sometimes he will spawn out of it, and itll bug him for good. Only open the barrier if hes inside it, if not, load an earlier save and try again until he is