Reported to me by someone else, (so this is a rough translation) but the basic details are:

• Created new world
• Play for a bit
• Close game
• Open the same world
• Crashes

Here is the attached report: http://pastebin.com/qFM9cwrk

As an update, this appears to be an isolated instance of the issue. Reinstalling his instance of MC appears to have fixed the issue.

Good to hear :)

Seem to have another instance of this issue. It's strange, and was caused due to a power cut while playing the world.

http://pastebin.com/kVTRtCKw

Yes, this will have caused data corruption, nothing I can do about that.
To fix the error, he should go to the save folder -> folder named "elec332" and clear all contents inside.

This will fix this :)

Alright, cheers. I'll note it down and inform them!

I have the same issue, i got a power cut and now every time i try to get into my world it crashes... I've tried cleaning the "elec332" folder, but that didnt work, also i noticed that the .dat files on the folder were empty.
I'm using Space Astronomy Modpack by mjrlegends.

(Crash Report)

crash-2017-03-08_21.03.56-server.txt