Error Accessing Lesson after Upgrade from 1.9.4 to 2.7 by Usman Asar - Friday, 1 July 2016, 4:16 AM Number of replies: 0 Just upgraded moole from 1.9.4 to 2.7.14, upgrades seemed worked alright so far, except for when I try to open a lesson, it shows error. Debugging info shows Average of ratings: - Permalink Reply