Scriptrunner add LDAP user to group

[Deleted user]

 if my Jira server user Directory is using LDAP. What will be the best way to :

getUserByName("A"),

addUserToGroup(user,group)

 error:

"message":"org.springframework.transaction.CannotCreateTransactionException: Could not create DirContext instance for transaction; nested exception is org.springframework.ldap.CommunicationException

Root exception is java.lang.ClassNotFoundException: com.atlassian.crowd.directory.ssl.LdapHostnameVerificationSSLSocketFactory