"$1" is already added as "$2". Please check the options in the sidebar. This is due to either the use of [//www.mediawiki.org/wiki/Help:TemplateData#aliases aliases] or [//www.mediawiki.org/wiki/Help:TemplateData#label labels].
If known, enter undocumented parameter names. Note that only parameters known by the template will have an effect. You may find information about existing parameters on the [[$1|template's page]].