Display details of YAML importing error
Importing YAML file, the message "Internal Server Error" is displayed if there is an invalid error response definition as following.
description: Successfully updated a user
$ref: '#/components/schemas/User' # <-- it has to be set Error Response compornent
It's useful to display if the details of error, not only "Internal Server error", for troubleshooting.
Please provide full document you were trying to import.