Host Menu Items are not visible in DotNetNUke - dotnetnuke-5

I am using DNN 5.2.2, host menu items are not visible on site when i click on host menu it return me blank page http://...../host.aspx
Can any let me know what is the problem.
Thanks

Here is the answer.(Dnn 5.6)
The following SQL scripts were run:
UPDATE Tabs SET PortalID = Null
where TabPath Like '//Host%' AND
PortalID Is Not Null
UPDATE Tabs SET ParentId = Null
where TabID=7

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