Unexpected Error when opening App in Rule Machine 5.1

Hi,
I am running the latest platform 2.3.9.158 on a C-7 hub. I have a rule that most of the time when I click on it gives me a screen with an error message:

Unexpected Error

An unexpected error has occurred trying to load the app. Check Logs for more information.

Error: Character is neither a decimal digit number, decimal point, nor "e" notation exponential mark.

I see the following in the log to go along with the rule:

app:3472024-07-04 05:01:00.752 AMerrorjava.lang.NumberFormatException: Character is neither a decimal digit number, decimal point, nor "e" notation exponential mark. on line 8650 (method periodicHandler)

How does one identify what in the rule is making this log entry? When I turn on all the logging options for the rule, it does not lead me to anything. Any thoughts on how to debug?

Here is the rule:

Triggers:

Select Trigger Events (ANY will trigger)

Thermostat mode of Upstairs Thermostat changed
Cool setpoint of Upstairs Thermostat(69.00) changed
Heat setpoint of Upstairs Thermostat(63.00) changed Every 1 minute

Actions for **HVAC - Upstairs HVAC set Mikhail's bed vents:
Set SetPointTemp to Upstairs Thermostat coolingSetpoint((69.00))
Set SetPointTemp to (SetPointTemp(70) + MikhailsbedTempOffset(0))
Set RoomTemp to Mikhail's bed temperature sensor on Hubitat-16 (attic) Temperature(69.0)
Set DeltaTemp to (SetPointTemp(70) - RoomTemp(71.7))
IF (Thermostat mode of Upstairs Thermostat cool(T) [TRUE]) THEN
IF (Operating state of Master Bed AC Thermostat on Hubitat-8 (nest) cooling(F) [FALSE]) THEN
IF (Variable RoomTemp(71.7) > SetPointTemp(70)(T) [TRUE]) THEN
IF (Variable DeltaTemp(-1.7) <= -0.5(T) [TRUE]) THEN
IF (My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair) level(10) ≠ Hundred(100)(T) [TRUE]) THEN
setLevel(100) on My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)
END-IF
ELSE-IF (Variable DeltaTemp(-1.7) > -0.5(F) [FALSE]) THEN
IF (My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair) level(10) ≠ Pre-
CloseMinVentLevel(10)(F) [FALSE]) THEN
setLevel(Pre-CloseMinVentLevel(10)) on My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)
END-IF
ELSE
IF (My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)(on) is on(T) [TRUE]) THEN
Off: My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)
END-IF
END-IF
END-IF
ELSE
IF (Variable DeltaTemp(-1.7) < 1.0(T) [TRUE]) THEN
IF (My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair) level(10) ≠ Pre-
CloseMinVentLevel(10)(F) [FALSE]) THEN
setLevel(Pre-CloseMinVentLevel(10)) on My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)
END-IF
ELSE
IF (My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)(on) is on(T) [TRUE]) THEN
Off: My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)
END-IF
END-IF
END-IF
ELSE-IF (Thermostat mode of Upstairs Thermostat heat(F) [FALSE]) THEN
IF (My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)(on) is on(T) [TRUE]) THEN
Off: My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)
END-IF
ELSE
IF (My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)(on) is on(T) [TRUE]) THEN
Off: My Flair Vent Mikhail’s bed-fb88 on Hubitat-6 (weather, lutron, flair)
END-IF
END-IF

Thank you!