Error Accessing Lesson after Upgrade from 1.9.4 to 2.7 ដោយ Usman Asar នៅ ថ្ងៃសុក្រ ទី1 ខែកក្កដា ឆ្នាំ2016, 4:16 AM ចំនួនតប៖ 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 មធ្យមភាគនៃរង្វាយតម្លៃ: - តំណ ឆ្លើយតប