Your catalog file(s) is/are not valid:

There was an error verifying catalog-info-fanitest.yaml:
Error: "metadata.name" is not valid; expected a string that is sequences of [a-zA-Z0-9] separated by any of [-_.], at most 63 characters in total but found "test filename customization". To learn more about catalog file format, visit: https://github.com/backstage/backstage/blob/master/docs/architecture-decisions/adr002-default-catalog-file-format.md

Please visit docs for more information.