Nest thermostat problems

I’m having problems with simulate switch, to control my Nest thermostat in this, keep giving me this error :: warn || NST Manager (v5.4.0) | ContactBook is NOT Enabled on your SmartThings Account

NST Manager (v5.4.0) | Polling BLOCKED | Reason: (Sending Cmd)

Are you trying to use the contact book?
This has been taken away as of 31st July.

I’m trying use thermostat timer , but still show me this error.

I don’t have Nest so cannot help with that I’m afraid.
The error is referencing the contact book which is why I asked the question if you were using the contact book.