https://www.dropbox.com/s/dko97adlnq0donh/crash-2016-09-06_19.06.57-client.txt?dl=0

It could because I have ~208 mods... but what's one more??

I just know that when I add this mod, my game won't start; it crashes during loading.

(I don't know what this mod adds, but if I were to make any suggestions, I'd say an in-game documentation, and more Thaumcraft. I like Thaumcraft. Thaumcraft is popular. Sorry, I know this is not what's supposed to be in a crash report.)

this issue may be related to not enough memory to java load classes, you may try to increase the "PermGen" size.
-XX:MaxPermSize=160m

or, your .jar is corrupted.

thanks.

about your comment, some Ingame doc would be nice, but this mod is mainly a learning experience for something way bigger.
about Thaumcraft, yeah, I may add in the future some interaction between Avaritiaddons and Thaumcraft, but no promises XD

Ok, thanks for the help. I'm looking into coding my own Thaumcraft addon, so... no rush. :)

hey, another thing that could be, is your java updated?
it requires Java 8.

I'm not sure. I'm running Java 8 on my computer, or something... (worth noting that I took a break from coding, for school) but when I launch Minecraft (using ATLauncher) it says I should be using Java 8, but I'm not sure how to fix it.

did you find what was causing the problem?

No, but I'm guessing I'm using the wrong Java version. I'm using 1.7 something, and I would switch to 1.8, but I'm not sure how to do it through ATLauncher.

it requires Java 8 to run, so, since we both know what is the issue, I am closing this.