Call to a member function setFormClass() on null in commerce_order_entity_type_build() (line 230 of modules/contrib/commerce/modules/order/commerce_order.module).

Hm... This has never been reported before, this would mean the profile entity type definition isn't available... Did you manage to uninstall the profile module without uninstalling the Commerce modules? Profile is a dependency?

The attached patch should still help.

I guess this extra check doesn't hurt... Committed!

Looks like the patch didn't fix the problem. New error:
Drupal\Component\Plugin\Exception\PluginNotFoundException: The "profile" entity type does not exist. in Drupal\Core\Entity\EntityTypeManager->getDefinition() (line 139 of core/lib/Drupal/Core/Entity/EntityTypeManager.php).

Automatically closed - issue fixed for 2 weeks with no activity.