Bukkit

What steps will reproduce the problem?
- idk

What is the expected output? What do you see instead?
- Nothing. Something.

What versions MobCatcher, CraftBukkit, and Spout (if any) are you using?
- MobCatcher v3.17 on spigot #1470

Have you previously had any older versions of MobCatcher on your server?
- Yes, since.... I think 3.14. In any case, v3.16 worked perfect for 1.7.2 on my server

Do you have an error log of what happened?
- http://pastebin.com/sNCsaca5

Please provide any additional information below.
- ~

What version of Craftbukkit is that spigot built on? Sometimes the spigot builds are hit or miss, even if the CB version matches the version i used, and if thats the case I typically can't do anything about it.

This error is different than the last one you showed me, but they both make equally no sense.

That line is

((Sheep) entity).setSheared(sheared);

The only thing that could be null is the entity, but thats passed in directly from the spawn.

Spigot issues are really hit or miss. It tends to do really weird unpredictable things to my plugins. By the time you have a DEV build of CB and spigot built on top of that theres infinite room for stupid errors that i can't replicate or fix.

I would suggest that you go back to an older spigot/mobcatcher. I simply can't iron out all these issues until there is both a stable CB and a stable spigot.