Jun 14 00:11:46 nazgul xpcproxy[1562]: CFPreferences could not connect to its daemon.
Preferences using the connection 0x0 will be volatile and will not be persisted to disk.
Jun 14 00:11:46 nazgul com.apple.xpc.launchd[1] (com.docker.helper[1562]): Could not find and/or execute program specified by service: 155: Refusing to execute/trust quarantined program/file: com.docker.helper
Jun 14 00:11:46 nazgul com.apple.xpc.launchd[1] (com.docker.helper): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
Information
Diagnostic ID: 07AF4266-0117-4CCE-B283-57AA41E1BD03
Latest stable OS X
Worth mentioning: it keeps spamming even when docker daemon is shut down.
Some other forum users had a similar problem, and resolved it by removing some files. Please have a look at this thread on the forum: Launch service cannot find com.docker.helper
You might also try uninstalling any prior version of Docker for Mac and installing the latest public beta to see if the behavior changes.
I’ve found the issue is tied to Download Quarantining - which would also explain why removing and re-installing fixed things. Doing the following will remove the Quarantine flag: