Given the plugin-third-party mention in the console, I disabled all of my plugins, rebuilt, same error. It occurs on Mac and Windows.
I’m not sure when this issue started, maybe sometime this afternoon. I did not make any changes on my side to cause the break, it just stopped working all of a sudden. Anyone else getting this, or know how to troubleshoot/resolve this problem?
How did you disable the plugins? By commenting them out in the app.yml?
You seem to have some sort of customization going on, as your latest looks to be unique. Have you tried disabling some of your Customizations in the Admin area?