Adding a Device - ERROR

Adding a Device - ERROR

I added a device to a category in OPManager. OPManager said that the device was added successfully to the category. When I go to access the device it is already labeled but has an error message "Status Message Unable to find the object : 10.8.19.X" I cannot delete this device or re-add it because it says that it already exists. I need HELP with this. Thank you!

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