Timer in Jython JSR233 script

Setup, Configuration and Use Scripts & Rules
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2

I define my timers in jython like this

myTimer = Timer(600,myFunction)
myTimer.start()

This runs fine for me on OH2.2. I do however see similar errors when I start OH2.3 snapshots. Most of them are related to the use of DateTIme (see here) I see the error mentioned there and also the same as yours:

Failed to execute rule 'ProcessTempHumRule-b9528181-c479-4780-8b0e-3ba03c115967': Failed to execute action '1': null

@nasi_be Which version of OH are you running?

EDIT: my above mentioned error is solved in the linked topic.