Problem with Z-buffer rendering engine

[Anonymous]

Hey guys i bit of a problem and i can't figure out what caused it.
When i start rendering with the Z-buffer it gives me the WARNING: An error occured with the following add-on : Z-Buffer rendering engine
It's happening for the first time, two days ago the same project was just fine with this render.
Does anybody know if this is fixable or is something serious. 10x

[Anonymous]

Actually it does that only from specific angles, maybe it got something to do with the textures or something heavy on the plan...