First thing i ran across was this conversation about the same issue. I couldn’t find it in the theme repo, but found it accessible via svn @repo.
Now please answer some basic questions: Which version (wp & quality control) are you running? Could you share a link to your install? Which modifications have you made? Have you deactivated all plugins and tried to reproduce the error?
EDIT
I took a look at the repository (latest is version 1.2 – please take a look at the link from @Rarst to verify that this is the version you’re using) and found the following theme functions called before your error messages:
- loop.php:
echo quality_ticket_status( $post->ID, 'slug' );(2 times, line 29 & 35) - singled.php: … nothing
I’d suggest you tell us exactly (in your best english) every detail about the request that produces the error: which page you’re on http://example.com/whatever-comes-here, what modifications you did, etc. Currently it’s fishing in the dark.