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並前往https://drupal.stackexchange.com/questions/15648/drupal-unexpected-fatal-error-class-name-must-be-a-valid-object-or-a-string

Class name must be a valid object or a string […] common.inc

The error means that Drupal can't find the entity type information for a entity that it tries to load. Add var_dump($entity_type); in there and reload the ...

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