ClassicEditor .create( document.querySelector( '.editor' ), { // Editor configuration. } ) .then( editor => { window.editor = editor; } ) .catch( handleSampleError ); function handleSampleError( error ) { const issueUrl = 'https://github.com/ckeditor/ckeditor5/issues'; const message = [ 'Oops, something went wrong!', `Please, report the following error on ${ issueUrl } with the build id "3wjw1eqrjc3x-kvzpp48qbb5r" and the error stack trace:` ].join( '\n' ); console.error( message ); console.error( error ); }