Docker image pull error: Error response from daemon: pull access denied

Dear Folks,

I have 3 registries under one project, the first 2 registries docker images are successfully getting pulled where as only ONE of the 3 throws error

“docker: Error response from daemon: pull access denied for registry.gitlab.com/abc/Web-service,
repository does not exist or may require ‘docker login’: denied: requested access to the resource is denied.”