Server crashed when i joined

[mrmcbloka]

my server has been working perfectly for a while but when i tried to join this morning it crashed.

here is the crash report:

http://paste.ubuntu.com/17028029/

mod edit: use pastebin

Edited June 5, 2016 by bochen415
user did not read the rules

[EvilOwl]

Your world files are truncated, use level.dat.old or revert to backup

[mrmcbloka]

5 minutes ago, bochen415 said:

Your world files are truncated, use level.dat.old or revert to backup

sorry i dont understand could you explain in more detail

[mrmcbloka]

On 6/5/2016 at 1:20 PM, bochen415 said:

Your world files are truncated, use level.dat.old or revert to backup

??