Hi Santhosh..
Have you assigned the License to the User?
Log in to SAp thru manager ID. Assign the license for that particular user under Administration->License->License Administration.
In the left pane of License Administration, you can see the list of users. Click on the user to whom the problem occurs and check whether the license is assigned or not for that particular user. If not then assign the respective license for that user.
Addon Access Users and SAP Addons . Apart from that you assign the required license for the user(Either CRM or Logistics or Professional).
Hope Helpful
Regards
Kennedy