If a n RCA under Rule 23 of the F ederal Rules of Civil Procedure is dismissed based on an erroneous interpretation of law , but not on the merits, does the named plaintiff seeking to represent the class retain a personal interest to appeal the dismissal if his/her individual claim became moot after the dismissal of the RCA?

Whether a named plaintiff whose individual claim becomes moot after the denial of a request for class certification and class action can still appeal the denial