Hello,

After further investigation of the issue, we realized that mismatching casing in the values of the name and path options is behind the exception. In the original dojo example we use an upper-case "Folder" for name and a lower-case "folder" for path. The current implementation requires both options to have the same casing, e.g.:

name: "Folder2",
path: "Folder/Folder2",

Here's an updated dojo example, in which no exception is thrown because the casing matches: https://dojo.telerik.com/ATUpUQoW

Currently, custom path values are not implemented in the widget, thus, we are closing this bug report. This could be subject of future enhancement.

Regards,
Ivan Danchev
Progress Telerik