I referred the below link and checked on the List of incompatibilities between the old serverclass.conf and what is supported by Forwarder Management.On commenting the unsupported attributes in serverclass.conf the Forwarder management page is showing details.
[global]
whitelist.0 = *
restartSplunkd = true
stateOnClient = enabled
disabled = true
https://answers.splunk.com/answers/185547/forwarder-management-issue.html
http://docs.splunk.com/Documentation/Splunk/6.2.1/Updating/Forwardermanagementcompatibility#List_of_incompatibilities
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