Hello Hwhuyler, Welcome to the WD Community. Where are you getting this error?
If you are trying to access the WD My Cloud remotely, you can use the www.wd2go.com website and you shouldn’t receive this error, if you are trying to access the drive on your local network you can map it and there is no need to access the drive through the application.
As indicated in the other thread you posted in, you may want to try the dedicated My Cloud Mirror subforum as this subform is primarily for the single bay My Cloud units and the single bay My Cloud units do not (officially) have Joomla module/website.