Object reference could not be set to an instance of an object.

[Callum_Steel]

So i was playing on my modded save and then at one point when i tried to load the save again i got this error:
https://gist.github.com/0bcfd3ab3af51cc57bfdda1c21cc6be0

Any advice would be appreciated as i have such about 40 or so hours into the save and would rather like to get it back.

Thanks.