SSPR Error 5016 "Can't Match User"

LDAP search error when logging into SSPR
SSPR unable to find LDAP user on log in
Error 5016 Error_Cant_Match_User (an ldap user for username value 'whatever' was not found
Error 5016 Error_Cant_Match_User (ldap error during search: Unprocessed Continuation Reference(s)

Add  (|(myCurrentName=%USERNAME%)   to
Settings -> Profile -> LDAP Directory Profiles -> Username Search Filter


Default Value:
(&(objectClass=person)(|(sAMAccountName=%USERNAME%)(cn=%USERNAME%)(mail=%USERNAME%)))


Value that worked:
(&(objectClass=person)(|(myCurrentName=%USERNAME%)(samAccountName=%USERNAME%)(cn=%USERNAME%)))

LDAP Search attributes incorrectly or not adequately defined

SSPR debug.log includes the following:

... TRACE, ldap.UserSearchEngine, username 'whatever' does not appear to be a DN (does not start with configured ldap naming attribute 'cn')

... TRACE, ldap.UserSearchEngine, username 'something' does not appear to be a DN (does not start with configured ldap naming attribute 'uid')

Another user solved the problem by using "uid" instead of "cn" in

"Settings -> LDAP Directory -> LDAP Naming Attribute (advanced)" per this forum post:
https://code.google.com/p/pwm/issues/detail?id=570


Note that with v 3.2 this setting is found under "Profile -> LDAP Directory Profiles -> LDAP Naming Attribute"