How do I find and kill an application which keeps restarting?

I am writing an application in Swift and I have attempted to allow it to launch at login by following a number of tutorials. This involves creating a launcher application and enabling it using SMLoginItemSetEnabled.

Things have gone horribly wrong. I followed the instructions to remove the main storyboard, but neglected to remove its reference in Info.plist. I think that as a result the launcher application crashes.

However the real problem is that I am now in an an endless loop. I get an alert that the launcher quit unexpectedly. Ignore simply restarts it, and Report… does the same. I cannot get it to stop restarting.

I have logged out, restarted, and also done so without reopening windows. I cannot find anything in ~/Library/LaunchAgents/, and, indeed, I can’t find the application anywhere.

In my /var/log/system.log I get:

Service exited due to SIGABRT
Service only ran for 0 seconds. Pushing respawn out by 10 seconds.

How do I go about finding this process and killing it once and for all?

You fix this simply by deleting the .application bundle. Then fix the problem with Info.plist in Xcode and rebuild.