I'm getting this js error ("$.timepicker is undefined") when I activate recent versions of the Meta Box plugin (tested with 4.5.4, 4.5.5 and 4.5.6). I also see 404 errors for /meta-box/css/jqueryui/jquery-ui-timepicker-addon.css and /meta-box/js/jqueryui/jquery-ui-timepicker-addon.js.
I tried duplicating/renaming the minified versions of those two files and that fixed the 404 errors but resulted in a new js error: "ReferenceError: RWMB_Datetimepicker is not defined".
I've disabled all other plugins but still get the error. Switching to the twentyfifteen theme makes the error go away, so I'm guessing the plugin is expecting my theme to load something it's not loading. My theme is for a customized CMS that outputs posts in json format so I don't load any js or css other than what WordPress loads by default.
Any suggestions will be greatly appreciated. Thanks!
Ira