Google Apps IT Resource Configuration Issue

I am trying to configure Google Apps connector to a Google Apps domain. But the configuration is not able to connect and give a error message like

org.identityconnectors.framework.common.exceptions.ConnectorIOException: com.google.api.client.googleapis.json.GoogleJsonResponseException: 401 Unauthorized

{

  "code" : 401,

  "errors" : [ {

    "domain" : "global",

    "location" : "Authorization",

    "locationType" : "header",

    "message" : "Login Required",

    "reason" : "required"

  } ],

  "message" : "Login Required"

}

        at org.identityconnectors.googleapps.operation.GoogleAppsSearch.searchUsersAndReturn(GoogleAppsSearch.java:211)

        at o

What values need to be provided for applicationName, serviceAccountId and serviceAccountUser?

I tried a lot of combinations but none worked.