Getting an internal server error when upgrading Moodle 2.8.8+ to Moodle 3.1.13

Re: Getting an internal server error when upgrading Moodle 2.8.8+ to Moodle 3.1.13

de către Howard Miller-
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Keep looking in your error log. There should be more information that indicates the root cause of the Error 500. 

I very much doubt any of those warnings are related.