An error pops up everytime when the Device Administrator is opened saying 'Failed to load all information from device list file'.

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This error comes when the site specific device password could not be loaded. Either the Devices.xml file is corrupt or the other reason can be what is explained in the popup above.
To remove this error, go to the below location and delete the 'Devices.xml'. This will be automatically created when the device will be added next time.
C:\ProgramData\Schneider Electric StruxureWare\Building Operation 1.9\Device Administrator