Horizons 1.0.7 java.lang.NoClassDefFoundError

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It appears to be a zombie that is causing problems. Try mcedit I assume it will allow you to remove it. The location within the world is below.

Entity's Block location: World: (143,69,1249)
 
I fired up the world in MCEdit and coudn't find anything that looked like the zombie entity at those coordinates. I just rolled the server back to the last backup. Hopefully it doesn't happen again.