hi i currently have ALLvidoe version 4.1 installed and it has worked great for years but has stopped working.
So i want to upgrade to the latest version 5.1

im using php 5.6 and the site is lrchmc. o r g

here is a link to a video, it seems every video is just showing a black screen with the older Allvideos 4.1 version
lrchmc.org/index.php?option=com_content&view=article&id=818

when i try to do the install/upgrade in joomla i get the following error message

500 - An error has occurred.
Unknown controller backup

Call stack
# Function Location
1 JAdministrator->dispatch() /home/lrchmc2/public_html/administrator/index.php:67
2 JComponentHelper->renderComponent() /home/lrchmc2/public_html/administrator/includes/application.php:136
3 require_once() /home/lrchmc2/public_html/libraries/joomla/application/component/helper.php:162
4 JError->raiseError() /home/lrchmc2/public_html/administrator/components/com_akeeba/akeeba.php:159
5 JError->raise() /home/lrchmc2/public_html/libraries/joomla/error/error.php:171
6 JException->__construct() /home/lrchmc2/public_html/libraries/joomla/error/error.php:136

Thank you that fixed it!!!!