Error Accessing Lesson after Upgrade from 1.9.4 to 2.7

Error Accessing Lesson after Upgrade from 1.9.4 to 2.7

by Usman Asar -
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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



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