Cache referesh error

[SpeleanAU]

HI, I'm new to Magento and Cron, and I've installed the Aoe Scheduler, but am now getting the following error, any suggestions would be great. Thanks.

Cron error while executing Caching_refresh_cache:

exception 'Mage_Core_Exception' with message 'Invalid callback: Model for Caching/observer::refreshCache does not exist' in /var/www/cms/outdoorestore/production/htdocs/app/Mage.php:595
Stack trace:
#0 /var/www/cms/outdoorestore/production/htdocs/app/code/community/Aoe/Scheduler/Helper/Data.php(316): Mage::throwException('Invalid callbac...')
#1 /var/www/cms/outdoorestore/production/htdocs/app/code/community/Aoe/Scheduler/Model/Job.php(145): Aoe_Scheduler_Helper_Data->getCallBack('Caching/observe...')
#2 /var/www/cms/outdoorestore/production/htdocs/app/code/community/Aoe/Scheduler/Model/Schedule.php(213): Aoe_Scheduler_Model_Job->getCallback()
#3 /var/www/cms/outdoorestore/production/htdocs/app/code/community/Aoe/Scheduler/Model/Schedule.php(623): Aoe_Scheduler_Model_Schedule->runNow(true)
#4 /var/www/cms/outdoorestore/production/htdocs/app/code/community/Aoe/Scheduler/Model/Observer.php(39): Aoe_Scheduler_Model_Schedule->process()
#5 /var/www/cms/outdoorestore/production/htdocs/app/code/core/Mage/Core/Model/App.php(1357): Aoe_Scheduler_Model_Observer->dispatch(Object(Varien_Event_Observer))
#6 /var/www/cms/outdoorestore/production/htdocs/app/code/core/Mage/Core/Model/App.php(1336): Mage_Core_Model_App->_callObserverMethod(Object(Aoe_Scheduler_Model_Observer), 'dispatch', Object(Varien_Event_Observer))
#7 /var/www/cms/outdoorestore/production/htdocs/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('default', Array)
#8 /var/www/cms/outdoorestore/production/htdocs/cron.php(78): Mage::dispatchEvent('default')
#9 {main}