No Data Available

No Data Available

Hi after i backup data and restored to a new opmanager server my switches interface's graphs have nothing to report ad show me "No Data" instead of this in,performance report also show me No data available in this period when i change the period to data before my backup everything is ok but after that is nothing also i try to add a new device but the new device also interface graphs has no data what ca i do for this problem?

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