I was going into the farming through the nether multi portal and it just crashed. Now whenever i try to log onto the server the pack crashes crash-report:
Can you post your crash-report to pastebin? It's much harder to read in a forum posting. In the mean time I've moved you back to spawn and you can try and log in again.
OK so resetting my position worked my only question now is if i go back into the mining world will i crash again?
You crashed because of Thaumcraft's Warded blocks. Do you know if there were any warded glass nearby? Or were you holding a wand with the warding foci?
The issue is rendering placed warded blocks, so blocks inside a chest is not the cause. Any warded blocks (not glass) nearby? Maybe even at a neighbour?