Fatal error: Call to a member function addItem() on boolean
Fatal error: Call to a member function addItem() on boolean in /home/ascent26/public_html/onlinestore/app/code/local/Sm/DynamicSlideshow/Block/Sliders/Preview.php on line 26
Sorry to hear you are having issues with your Magento throwing a fatal error. This type of error is a coding error, so some particular condition occurred that caused the addItem function to throw a return code of "False", causing the error. It appears to be from a Dynamic SlideShow, which may be some sort of addon or module. If that is the case, you will want to check with their support team and give the error. You will also need to detail exactly what you are doing when the error occurs, step by step. This can help duplicate the issue and track down the error.
Kindest Regards,
Scott M