crash report

First try updating you java, as your version is outdated. If that doesn't work then its possible your world file is corrupt. Can you play other worlds? Also please do not list bugs as private unless they are security issues.

i updated java, still doesn't work. and yes i can play other worlds.

Then yes it looks like your world files are corrupted.

Note to self:

Description: Exception ticking world
java.lang.NullPointerException
at im.b(SourceFile:199)

Based on a crash report provided in this issue, I believe with high certainty that this report may be a duplicate of MC-3583. If I am wrong, please go yell at Dinnerbone.

Duplicate of MC-2749.