Cannot use the beta-pre9 version (part of dw20pack 1.1.0) of AE2
Maybe because of [appliedenergistics2@[rv2-beta-7,) in dependencies ?

[18:06:01] [Client thread/ERROR] [FML/]: The mod thaumicenergistics (Thaumic Energistics) requires mod versions [appliedenergistics2@[rv2-beta-7,)] to be available

"[appliedenergistics2@[rv2-beta-7,)]" is supposed to mean that version or higher.
Apparently the word 'pre' is throwing off forges version detection.
You would need to rebuild the mod from source to change/remove the dependency. Or, if you are careful, you could replace the word 'pre' with '000' in the AE version tag. Keep in mind that it has to be exactly 3 zeros if you do that.

I was just about to come post this exact thing, any news on this being fixed?
Never mind this can be closed now, just checked on AE2 and they now have the actual beta 9 release as of 18hrs ago from this post. Just download and replace the one in the DW20 pack and it will work :)

http://www.curse.com/mc-mods/minecraft/223794-applied-energistics-2

OK :)