There is a bug in the ST Android phone app, when the DH asks the use to enter a decimal number with a range it throws an error. Please report it to ST Support so they can prioritize fixing it.
Meanwhile try this simple workaround, in line 34, remove this (starting from the ,)
, range: “0.1…5.0”
And made sure you don’t enter any values less than 0.1 or greater than 5.0 for the temperature sensitivity.