change the mode, on terminal type chmod -R 755 Path_to_App/app.app and then try to Staple it will work

How to add this HiddenPort property ? I have added that property in the Plist . Used Boolen type and set it to False Reset the driver Extension, rebooted my iMac and then activated the extension. But I can't find my device in Network Preferences. Do we need to add this hidden port Property somewhere else