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Every time I join a server I've been on before FTB crashes, it crashed about 5 times just trying to start earlier today. all from NullPointerExceptions
Ok, so we can rule out that your client side modpack is mismatched, and that the actual world is corrupted.
Can you open the server on your end, join it, and get your launcher console log from that? I need to compare them. I've seen this error before, but I honestly don't recall the fix. So for compare and contrast mode!
Suggestions I can provide now:
try deleting your player.dat file. This will reset your spawn point to server spawn and clear your inventory, but I don't think this will help
http://pastebin.com/KDJ5zp3v here are the server logs with only me on the server running on my computer that works. I'm going to have my friend go through the same processes that i have at the beginning to rule out client problems.
I've also noticed that certain parts of some texture packs are being replaced with the vanilla textures, but that's probably not got anything to do with the server issue. here are the logs: http://pastebin.com/CmEadRbV