It is not an error. The message prompt is to check if the user would like to allow the plugin "vmware-CSD" to run or not.
The plugin is needed for various operations and usecases.
User would need the plugin to run if the windows session credentials are used to log in to the vcenter server.
And in vcenter 6.0 (and lower versions) plugin is needed for OVF & data store related operations.
Hope that helps.