I was doing some screenshots for EE3 wiki and I got a crash when I opened my Tome of Alchemical Knowledge.
http://pastebin.com/NzSML5qs

It happened only once and not the first time I openned it. Latest version.

Most likely cause: Minecraft being kind of stupid with memory handling.

nothing Pahimar can do for you there.

Oh well

There is nothing in that crash log that points directly at EE3 as the casue.

Does this same crash happen every time you open the ToAK or just that time?
If every time: What version of EE3 are you using?