I just started the quest where u get the skull of corruption, well anyway, I follow erandur through the door of nightcaller temple and once inside he's like 100 meters through the wall, i had ta tcl through the wall to get to him and once I'm there he's like "what can I do for You my son?", I break out of the conversation then he says "Follow Me" and then nothing more...

Now that's through the wall, not at the start of the dungeon where he's supposed ta magic the next door open...

Has anyone come across this? is there a solution?

If you can use tcl, I'm assuming you're a PC player and there is a workaround. First off deactive tcl, get back to the first room in the shrine where Erandur's set up the Shrine to Mara. Enter the following codes in: prid 00024280 then moveto player

This will move Erandur back to you and he should path correctly now.

Hey yup, yeah that worked, cheers man!

Happy to help!