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異常-Argument 1 passed to renderer_base::render() must implement interface renderable, null given, called in [dirroot]/login/alt_index_form.html on line 112

關於這個錯誤的更多資訊

Debug info:
Error code: generalexceptionmessage
Stack trace:
  • line 221 of /lib/outputrenderers.php: TypeError thrown
  • line 112 of /login/alt_index_form.html: call to renderer_base->render()
  • line 348 of /login/alt_index.php: call to include()