YAML Metadata Error: "language[1]" must only contain lowercase characters

YAML Metadata Error: "language[1]" with value "hy-AM" is not valid. It must be an ISO 639-1, 639-2 or 639-3 code (two/three letters), or a special value like "code", "multilingual". If you want to use BCP-47 identifiers, you can specify them in language_bcp47.