Convert bool to string

def Save_Settings(event):
 configFile = File("config.properties")
 inProps = Properties()
 inProps.setProperty("Member", check_member_enable.isSelected())
 outputStream = FileOutputStream(configFile)
 inProps.store(outputStream, "host setttings")
 outputStream.close()

I get this error: TypeError: setProperty(): 2nd arg can't be coerced to String
I try: inProps.setProperty("Member", String.valueOf(check_member_enable.isSelected())

**How can I make this work.. ???
Thank you!