no such process error with launchctl start. Mac OSX 10.9
Solution 1:
Try using the launchctl command:
launchctl load /Library/LaunchAgents/com.myfile.hostname.plist
This will load the job ticket rather than start a named job.
I am not sure pipes are permitted within a launchd job ticket list of arguments. Using them requires the argument to be passed to a shell for interpretation and this may not happen. Consider passing the command directly to /bin/sh as a single argument.
Solution 2:
Removing the leading directories worked for me:
sudo launchctl start homebrew.mxcl.bind