I have this problem too, using Enpass 6.0.7 (373) on Mac OS Sierra 10.12.6 (16G1918).
I tried @Anshu kumar's solution, but it did not solve the problem.
My syslog continues to look like this, for thousands and thousands of lines, stretching on into eternity.
Apr 29 02:15:04 ### com.apple.xpc.launchd[1] (in.sinew.Enpass-Launcher[1676]): LaunchServices returned a bundle URL that does not match with the LoginItem's known association.
Apr 29 02:15:04 ### com.apple.xpc.launchd[1] (in.sinew.Enpass-Launcher): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
Apr 29 02:15:14 ### com.apple.xpc.launchd[1] (in.sinew.Enpass-Launcher[1677]): LaunchServices returned a bundle URL that does not match with the LoginItem's known association.
Apr 29 02:15:14 ### com.apple.xpc.launchd[1] (in.sinew.Enpass-Launcher): Service only ran for 0 seconds. Pushing respawn out by 10 seconds.
Since the above solution did not work for me, is there another thing I can try?
Thanks.