This function or event no longer exists in version 5.1.0 of World of Warcraft. Please check the main API page for an up-to-date listing of the valid API functions
Returns the number of additional members in the player's party. As of 5.0.4, the function is replaced by
See also Party functions.
numPartyMembers- Number of additional members in the player's party (between 1 and
MAX_PARTY_MEMBERS, or 0 if the player is not in a party) (