"After finishing to prepare a quiz, when you go to see quiz, only appear a blank page. I put in debug mode and received the following message "Fatal error Class name must be a valid object or a string in C \moodle\moodle\lib\pagelib.php on line 67". You can see the error visiting "http //www.cursostelecom.lastingnet.com/mod/quiz/index.php?id=2" in this link, click on Test1 see the message."