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1、 my plist /Library/LaunchAgents/com.vivi.control.serviceAgent.plist like this: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>com.vivi.control.serviceAgent</string> <key>ProgramArguments</key> <array> <string>/Users/yuellppa/Downloads/vivo_test</string> </array> <key>RunAtLoad</key> <true/> </dict> </plist> when the label is other any name but not "com.vivi.control.serviceAgent", use launchctl load /Library/LaunchAgents/com.vivi.control.serviceAgent.plist and launchctl unload /Library/LaunchAgents/com.vivi.control.serviceAgent.plist is ok. when label is "com.vivi.control.serviceAgent", launchctl load or launchctl unload get error 5: Input/output error. use launchctl list | grep com.vivi.control.serviceAgent get nothing, so has no conflicting service。 Can anyone help me take a look?