Error applying mail filter modifications

A while ago I was getting an error box appear titled "error applying mail 
filter modifications" with the content "NO No items found". I haven't had one 
for a few months, but now it looks like they're back.

This happens when I first load up Kontact 4.13 in Kubuntu 14.04. I've looked 
in the filter logs, but can't find anything to say why this is happening.

-- 
Registered Linux User #466407 http://counter.li.org
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