Fatal error: Uncaught Error: Cannot instantiate abstract class Hackathon_MageMonitoring_Model_Widget_Abstract

[mozgbrasil]

Hello

Good Morning

When I click on the "Tab Config" button

I am redirected to another screen that is not completed

When I see the source code got the error below

Fatal error: Uncaught Error: Cannot instantiate abstract class Hackathon_MageMonitoring_Model_Widget_Abstract in /home/marcio/dados/public_html/magento-1.9.2.4-dev31/vendor/magento-hackathon/hackathon_magemonitoring/app/code/community/Hackathon/MageMonitoring/Helper/Data.php:87
Stack trace:
#0 /home/marcio/dados/public_html/magento-1.9.2.4-dev31/vendor/magento-hackathon/hackathon_magemonitoring/app/code/community/Hackathon/MageMonitoring/Block/Tab/Config.php(221): Hackathon_MageMonitoring_Helper_Data->getActiveWidgets('*', NULL, false)
#1 /home/marcio/dados/public_html/magento-1.9.2.4-dev31/vendor/magento-hackathon/hackathon_magemonitoring/app/design/adminhtml/default/default/template/monitoring/tab/config.phtml(142): Hackathon_MageMonitoring_Block_Tab_Config->getWidgetTreeJson()
#2 /home/marcio/dados/public_html/magento-1.9.2.4-dev31/app/code/core/Mage/Core/Block/Template.php(241): include('/home/marcio/da...')
#3 /home/marcio/dados/public_html/magento-1.9.2.4-dev31/app/code/core/Mage/Core/Block/Template.php(272): Mage_C in /home/marcio/dados/public_html/magento-1.9.2.4-dev31/vendor/magento-hackathon/hackathon_magemonitoring/app/code/community/Hackathon/MageMonitoring/Helper/Data.php on line 87