Recently we have upgraded to AEM 6.3 from AEM 6.1.
After upgrade dialog is throwing below error in classic ui.
Uncaught TypeError: Cannot read property 'toString' of undefined
at constructor.setOptions (widgets.js:112930)
at new constructor (widgets.js:113468)
at Object.create (widgets.js:25802)
at sb.createComponent (widgets.js:30428)
at sb.lookupComponent (widgets.js:30416)
at sb.add (widgets.js:30222)
at sb.<anonymous> (widgets.js:30218)
at Object.each (widgets.js:1780)
at sb.add (widgets.js:30217)
at sb.initComponent (widgets.js:30108)
Can you elaborate the issue or upload the sample component package to reproduce the issue ?
I need to understand which widget is throwing this error to find a fix