Thanks for your advise to activate CM Client. I have updated the LDAP parameter and now I can login to tyhe system.
I'm facing some other problem like the following.
1. When I was trying to Scan or import the document, I'm recieving the following error
Error: System Could not create a document object
"DGL5341A - When a client tries to consult the DNS server to configure out the IP address of the host name, the DNS srever responds that the host name is found in its database; there is no valid association of IP address to the host name to be found:: [Host] contentmgr.datec.com.fj [STATE]: WASNO_DATA"
2. When I was trying to search the existing document, I couldn't open the document and the following error was occured
"There was a problem opening the Document. Unable to open the selected Image"
Please advise me the real cause and some solution for the above issues.