Whenever I run the game with this mod I get a "Error in assignID, item with name 'accumulator' does not exist.

Same here

I have not been able to replicate this issue. Can one of you provide the following information:

1) Do you use Steam, normal Factorio, or other site?
2) What version of Factorio are you using?

Same problem
Steam
Newest

Are you using the experimental version? You have to enable experimental betas to get 0.13.x, otherwise you're using some 0.12 version. This mod has not been tested with .12.x, and that might be the problem

I'll do some tests and see if that's the problem

EDIT: I just tested this, and it fails if you're using a 0.12 build. I'm assuming all of you are using 0.12. I'm going to post some instructions in another general forum for this issue

There is now a new thread that tells you how to fix this error. The mod is not broken.