Receiving an "invalid set temperature" error message when I attempt to set the temperature for a heater

[johnobrien]

Describe the bug
When I attempt to set a target temperature for the heater I have hooked up to the Raspberry PI I used with the OctoPrint-Enclosure plugin, I receive an error message from Enclosure indicating "invalid set temperature".

To Reproduce
Steps to reproduce the behavior:

1. Go to the "Enclosure Plugin" tab on the main OctoPrint web interface.
2. Click on input field where you can set the Target temperature for the heater for the enclosure.
3. Type "80" for 80 degrees Fahrenheit.
4. Click the checkbox adjacent to the input field.
5. Observe the error message that is displayed (Enclosure Invalid set temperature.)
   

Expected behavior
I expected the Enclosure Heater to turn on and run until the ambient temperature measured by the sensor rose to 80 degrees Farenheit.

Additional context

octoprint-systeminfo-20211030183303.zip