Custom Report Graphs not showing data

Custom Report Graphs not showing data

I have OpManager free edition installed on my machine for testing. I have added the WMI resource monitor for CPU, Disk and memory utilization for 3 mwindows machines. Everything was going fine from the last 1 month. I was able to see the custom report graph for CPU Utilization for my host machine (on which Opmanager is installed) but all of a sudden today when i checked i was not able to see the CPU Utilization custom report graph. It says "Data Not Available". It doesn't even show the last week graph which was previously there. When I tested the WMI Monitor it is working fine. Same is the behaviour for Disk and Memory utilization. Please Help.

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