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
Lesson
Error Accessing Lesson after Upgrade from 1.9.4 to 2.7
Гэтае абмеркаваньне было заблакавана, таму вы болей ня можаце адказваць на яго.