patch scan problem

patch scan problem

When trying to deploy missing patches I am receiving the message "No data available Reasons: The computer is not scanned for identifying the vulnerable patches. scan now" , even though it is displaying 180 missing patches for the pcs I am trying to deploy patches for, and the scan status has finished today successfully, when I try to scan again the page remains on scanning and is not finishing scan.
I have the latest DC9 SP.
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