Yes, of course, the class folder named "classes".
This is not the problem. Thank you anyway!
I was having a similar problem, and found a solution that might work for you too.
When I was specifying a new class, I originally chose a different name, and then modified it later. However, when the type was registered in the elgg_entity_subtype table, it assigned it the original name.
You might be able to go into your phpmyadmin and edit the cell assigned with your myuser object to use the MyUser class.
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