No devices found in the Servers Category.

No devices found in the Servers Category.

All services of OpManager are running fine. When I access Web Client and go to any MAP Snap Infrastructures. I found following error:
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No devices found in the Servers Category
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When I try to add some of my domain machine I received message that "Machine is already exists". Please help me how I can recover all category devices. Which are still in the Database




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