This error usually refers to the usage of the slice
One very common reason is that the Kendo UI Data Source
instance is passed a JSON data which should be an array and is not.
If you have a license for the Kendo UI Professional library (kendo.all.min.js
is part of the paid Kendo UI Pro distribution), you will be able to access the development, non-minified version of the library in your account. You can also use the open-source Kendo UI Core library and its non-minified version.
I hope that this helps.