Hi Gary,
Here's a list of things that needed to be done from Erk's wt:
SPOILERS:
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Before lighting the lamp, you need to:
1) Visit all the people in the lodge and talk w/ them.
2) Sneak into Preiss's room and get the rope.
3) Using the rope, climb out Preiss's window and into von Zell's room, where you need to get the sheet of paper from his address book and see the muddy footprint under the bath mat.
4) Get the lamp from the main closet, the shears from the stables.
5) Go out into the woods. Find the place with the muddy footprint (same as the bathroom!),then find the brambles. Cut through them with the shears.
Go look at the cave. There's also something on the ground beneath the brambles I think you need to look at.
6) Come back in, show the tags to Klingmann so as to adjust his attitude.
7) Go back downstairs. The fire will be lit. Get the matches off the top right of the mantle.
Make sure you have done everything I mention here