I have had the problem for a few days that Minecraft crashes as soon as I want to enter a server. I start Minecraft Hexxit with the TechnicLauncher. Everything worked fine last week, but now I always get "unexpected error".
I'm really desperate at the moment. I have already downloaded Java 64 and have increased the RAM to 2 GB in the TechnicLauncher in the Java Settings options. I have also completely uninstalled the TechnicLauncher and downloaded it again. Nothing helped. My sister can still play on the server with her PC. Only I have the problem. Maybe someone else had a similar problem and still knows a way to rejoin the server?
I often have the problem, but for me it is enough to simply restart Hexxit. Maybe you can try to save the worlds etc. From Hexxit and then reinstall them