Perception Error Message

What do I do if, when trying to access a course/exam, the message "Access denied - Unable to proceed due to improper call of Perception" appears on my screen?

This error message most typically is related to Flash Player not loading the course properly. Please delete the cache in Internet Explorer (Tools > Internet Options > General Tab > delete browsing history). Close Internet Explorer. Reopen Internet Explorer and reinstall the latest Flash player: http://get.adobe.com/flash player/. Additionally, be sure that Internet Explorer is set to "Trust our training site." You may do this in Internet Explorer by going to Tools > Internet Options > Security Tab. Select "Trusted sites" and click the Sites button. Add the website to the zone and uncheck the box "Require Server Verification..." Press the Close button and then the OK button.