Latest Blog Module causes Error

I just installed latest version 5.2.1.
On my site I get fatal error, when I feature a blog post it gives me a blank screen, module latest Blog. When I unfeature is work fine.

Error: Fatal error: Uncaught Error: Call to undefined method Error::setProperties() in /home/atolsolu/public_html/ArtMarket/plugins/system/koowa/koowa.php:169 Stack trace: #0 /home/atolsolu/public_html/ArtMarket/plugins/system/koowa/koowa.php(142): plgSystemKoowa->errorHandler(Object(Error)) #1 /home/atolsolu/public_html/ArtMarket/plugins/system/admintools/feature/shield404.php(81): plgSystemKoowa->exceptionHandler(Object(Error)) #2 /home/atolsolu/public_html/ArtMarket/plugins/system/admintools/feature/shield404.php(59): AtsystemFeatureShield404::doErrorHandling(Object(Error)) #3 [internal function]: AtsystemFeatureShield404::handleException(Object(Error)) #4 {main} thrown in /home/atolsolu/public_html/ArtMarket/plugins/system/koowa/koowa.php on line 169

I also like to mention that authorsguildoftn.org is twice in my subscriptions. Please replace one with atol-solutions.com..Thanks