Server Error in '/' Application.

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Root element is missing.

A: This error means that IIS_WPG group doesn't have Read and List Folder Contents permissions on C:\Windows\Temp folder on the server where DNP Enterprise Server is running. Just add IIS_WPG group with Read and List Folder Contents permissions on the mentioned folder on the DNP Enterprise Server .

Please note that your should grant permissions to the domain IIS_WPG group if DNP Enterprise Server is running on domain controller or local IIS_WPG group in other cases.

Also note that it is good practice to grant those permissions to IIS_WPG on C:\Windows\Temp folder (or another folder in case of non-standard Environment Variables settings) on all servers running any DNP component.