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Drupal 8 module problem: No 'Access-Control-Allow-Origin' header



When I install the Drupal 8 module and configure it, attempting to log in gives me this message: WE COULD NOT REACH THE SERVER. PLEASE CHECK YOUR CONNECTION AND TRY AGAIN.

And I’m seeing this network error: Failed to load Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘’ is therefore not allowed access.

Any ideas how to solve this? Thanks in advance!