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I moved rules from sites/all/modules/ to sites/all/modules/contrib and got this error:
PHP Fatal error: Class 'RulesEventHandlerEntityBundle' not found in /path/to/drupal/sites/all/modules/contrib/rules/modules/node.rules.inc on line 147
It seems that the module registry is confused, and even when running Registry Rebuild, the problem remains.
It couldn't hurt to specifically load the parent class, no?