I know that AAC is not compitable and the dev is not helping, but now the bugs stopped crashing the players, but it has errors. Is it fixable? the console errors are related to protocollib so this can be caused by another plugins that use the same features too. Anyways this is the console log on player join http://pastebin.com/U3pA8M01
That error was caused using the latest Spigot 1.8.8, AAC latest version, ViaVersion 0.4.6 and protocolib 3.6.5 (not the latest but the recommended for 1.8.8 spigot)
@ridalarry man can we just drop this, protocol lib causes the errors because the plugin using it is doing something wrong. I prefer you not wasting my time. You can suppress errors in the config if you wanna live on the edge, but I'm not gonna support AAC.
@i9hdkill Do you mean the Spigot post? Other plugins could use the same thing what causes this problem as AAC. It is the error what you get from AAC, but it could also be another plugin since he doesn't say his plugin list.