Sonar Qube LDAP configuration

SonarQube version : sonarqube-8.2.0.32929-developer-edition
Trying to implement LDAP for single sign on. I am facing the below error please help me to fix this issue

Settings used:-

LDAP configuration

sonar.core.serverBaseURL=https://companydomain.com

General Configuration

sonar.security.realm=LDAP
sonar.authenticator.downcase=true
ldap.url=ldaps://companydomain.com:636
ldap.bindDn=CN=serviceaccount,OU=SpecialUsers,DC=companyname,DC=com
ldap.bindPassword=password

User Configuration

ldap.user.baseDn=OU=Users,DC=companyname,DC=com
ldap.user.request=(&(objectClass=person)(memberOf=CN=Sonar_Qube_DEV,OU=entitlements,OU=SonarQube,OU=Groups,DC=companyname,DC=com))
ldap.user.realNameAttribute=cn

Group Configuration

ldap.group.baseDn=CN=Sonar_Qube_DEV,OU=entitlements,OU=SonarQube,OU=Groups,DC=companyname,DC=com
ldap.group.request= member=*

Error:-
2020.07.29 04:27:48 INFO web[org.sonar.INFO] Security realm: LDAP
2020.07.29 04:27:48 INFO web[o.s.a.l.LdapSettingsManager] User mapping: LdapUserMapping{baseDn=OU=Users,DC=MerckGroup,DC=com, request=(&(objectClass=person)(memberOf=CN=Sonar_Qube_DEV,OU=entitlements,OU=SonarQube,OU=Groups,DC=MerckGroup,DC=com)), realNameAttribute=cn, emailAttribute=dnapS115671}
2020.07.29 04:27:48 ERROR web[o.s.s.p.Platform] Background initialization failed. Stopping SonarQube
org.sonar.api.utils.SonarException: Security realm fails to start: null