SimpleDimmer error when starting HS

Hi,

I get the following error when I start HS:

"Starting up....

30-Aug-16 08:09:25 ~!~JowiHue~!~Error: (LoadSettings):Unknown setting:SimpleDimmer Value:FalseStartup Complete, 1 errors detected, check the log for more information."

The log does not give any additional information as far as I can see.

I've previously both enabled and disabled the "Show 'simple' dimmer switch values" option, but currently it is enabled. I've also previously both created and deleted Dimmer Switch devices.

How do I get rid of the error message?

Thanks!