Email issue via Collaboration Room

Hi All,

I am new to collaboration rooms. I am currently facing an issue where a user is not able to send emails via Collaboration Room. I have checked logs against the user id in NWA and found that around 5 user id's are getting selected, that now do not exist, and the user is getting error message "Mail could not be sent to specified recipients"

I obtained the mailing list from the user in concern and found that these 5 ids are not there.

Steps performed for emailing by user in concern:

1)      Click ‘Project Members’ link in the left hand sides menu;

2)      Click the ‘ABCDE Cost Model’ tick box

3)      Click the ‘Collaboration’ button and Select ‘Send E-mail’

Following is error message in  found in NWA.

No id to access LDAP object available for principal unique id USER.CORP_LDAP.jkeenan1; object doesnt exist

Error while populating 'USER.CORP_LDAP.jkeenan1'

No id to access LDAP object available for principal unique id USER.CORP_LDAP.kmcdonald; object doesnt exist

Error while populating 'USER.CORP_LDAP.kmcdonald'

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com.sapportals.wcm.util.acl.PermissionExistsException

com.sapportals.wcm.util.acl.PermissionExistsException

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com.sap.ip.collaboration.gw.impl.transport.javamail.exception.MailSendException: The mail could not be sent to the specified recipients

The mail could not be sent to the specified recipients com.sap.ip.collaboration.gw.impl.transport.javamail.exception.MailSendException: The mail could not be sent to the specified recipients

Thanks,

... -.-.