I use the most recent version of AE2 and it is on a server i co run, but everytime I go, or anyone else, uses the Network tool, i.e. right click a cable or other ME block, it causes the server to crash.
Use a Network Tool on a network with an auto-craft setup. Expected behavior
Server will crash.
This is most likely caused by some AE2 addon missing a representation when being displayed in the network status.
Currently I cannot say which one it might be. Best approach for now would probably be to make a backup of the save and remove one AE2 addon, start minecraft, and repeat that until the crash stopped. Then report it to whatever addon was removed last.
Otherwise I will look into adding some logging for it in the next release. Technically I could skip it, but resolving it correctly would be better.