My question is about a theme named quality control which was available at wordpress repository. The plugin developer is not available at this moment and I hope I get resolution for my problem here

These are the errors and many others are reporting the same error on the theme's official site(Support is not available)

Catchable fatal error: Object of class WP_Error could not be converted to string in /public_html/wp-content/themes/quality-control/single.php on line 55

and some times...

Catchable fatal error: Object of class WP_Error could not be converted to string in \wp-content\themes\quality-control\inc\templates\loop.php on line 37

Could anybody help me with this?I can give admin access to my site to replicate the error

Update :

The WordPress version I am using is 3.1 and I have tried both the theme versions 1.5 and 2.0 versions .

http://ffav.in is the address of web-site and these are the URLs for some example posts with errors :

1. http:// ffav.in/ticket/test/

2. http:// ffav.in/category/uncategorized/

Thanks!