FTB Ultimate world lost? - Help

[Kryptos]

Hello here is my crash report.
http://pastebin.com/VwgCJB0V
I have windows 7.
It happened when I middle mouse clicked a wireless redstone transmitter. The crash shuts down the server first. Then give me the report. Would love any help, this is a pretty precious save. Thanks so much!

Here's what i was working on, if you care.

http://i.imgur.com/SdBrc1g.jpg
http://i.imgur.com/WQsZpn3.jpg
http://i.imgur.com/Ygm7W7P.jpg

 

[Kryptos]

Hello Again! So I never ended up figuring out how to fix that crash so I played a much earlier backup of that world. Progressed a massive amount then fell victim to the SAME crash through the same "thoughtless" error. Middle clicking a wireless redstone transmitter.

At this point I've sunk dozens of hours into this build over the last few days and am desperate to recover this world. PLEASE help if you know of a way to recover this world. I didn't expect this issue in the direwolf20 pack as the last crash was in the Ultimate pack but anyways... attached is my crash report, and here is a pastebin to the contents of said file. http://pastebin.com/9L7q2Zej

 

[Kryptos]

Anyone? Anything? Is there a way to reset my inventory? I feel like that might have a chance as it was the modification that broke my world.

 

[Kryptos]

OK! So by replacing the level.dat file with one from another world I was able to get back into the world, though now it's adopted the name of the donor world. "Problem solved." I assume I won't be the last to have this issue so ill just leave this here. Thanks for all the help.

 

[traumatism]

best thing to do is set up a backup system for it so that it increments the backups. In the players folder are files for each person who enters the server. you can copy these over from one server to another and your character inventory will follow