Upgraded from C5 to C8. Now I am getting this error.
A pre-exisiting rule as well as a newly created rule give me a Goovy Cast Exception "org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'null' with class 'null' to class 'double'. Try 'java.lang.Double' instead on line 9052 (method appButtonHandler)"
Devices -All Zigbee devices. Group managed Sengled led lights and Smart things motion sensor.
The Button Handler reference at the end of the error may mean this is something different, but I wonder if it is related to the topic below...? Like Bruce requested on there, I would also post a screenshot of your rule and turn on logging in the rule to try and work out where exactly the error may be being generated. Also double-check the devices used in your rule are referencing are still functioning as expected, particularly when controlled from the HE hub.