<PROTECT> *Function not allowed in IRIS Native python

Hello Community,

I got the PROTECT error while running functions. But, I could able to call the classmethods and methods in class definition with classMethodObject, classMethodValue etc.. from python. without any errors
python code

irispy.functionString('fnString','IRISPython',14)
irispy.function('fnString','IRISPython',14)

raise RuntimeError(error_message)
RuntimeError: <PROTECT> *Function not allowed

IRISPython.mac
fnString(fn1) public {
  quit "Hello "_fn1
}

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