This crash appeared to me aswell. It happens, because you placed the extension before the core, right?
Got the GUI-crash fixed in my unofficial version.
Nope, that crash actually happens at any time. The first time I got it, I had not even made any extensions yet. I just set the core down, right-clicked it and got that crash.
I am getting a client crash similar to the last few reported, while right-clicking on either the extensions or the core. This only happens while connected to a server. In single player with the same mods loaded, it opens the GUI just fine. I'm on MC1.6.2, and the server is running mcpc-plus-1.6.2-R0.1-forge819-B49.
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Nope, that crash actually happens at any time. The first time I got it, I had not even made any extensions yet. I just set the core down, right-clicked it and got that crash.
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http://pastebin.com/h1BgM9uw
Also, if I shift-click on one of the tanks to disguise it with a block, the server crashes. Again, it works just fine in a single player world.
http://pastebin.com/f84AazcR