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FileManager script error - Cannot read property 'classList' of null

I've created a FileManager using the basic sample code


ej.base.enableRipple(true);

    ej.filemanager.FileManager.Inject( ej.filemanager.DetailsView, ej.filemanager.Toolbar, ej.filemanager.NavigationPane );

    var hostUrl = GSDUtils.resolveUrl( 'api/Resources' );

    var fileObject = new ej.filemanager.FileManager({
            ajaxSettings: {
                url: hostUrl + 'FileOperations',
                downloadUrl: hostUrl + 'Download',
                uploadUrl: hostUrl + 'Upload'
            },
        allowMultiSelection: false,
        allowDragAndDrop: false,
        view: 'Details'

    });
    fileObject.appendTo( '#filemanager' );

The component loads and populates as expected, however, when I click on a folder in the folder Tree (left hand pane) I get a scripting error in the console - "Cannot read property 'classList' of null"

treeview.js:1396 Uncaught TypeError: Cannot read property 'classList' of null

    at t.clickHandler (treeview.js:1396)

    at tap (treeview.js:3831)

    at e.notify (observer.js:99)

    at t.e.trigger (base.js:181)

    at t.n.endEvent (touch.js:118)

The scripts are loaded using the latest version from the CDN 

from - https://cdn.syncfusion.com/ej2/dist/ej2.min.js

and - https://cdn.syncfusion.com/ej2/fabric.css


Can you suggest where the problem might be ?


Thanks


Gary