My colleague answered your question in the support ticket you have opened but we will also copy the answer here, in case others are interested in the reply:
I investigated the issue you are describing and in the end figured out that you have not declared your Kendo UI DataSource correctly. You are setting the url to the transport.read property directly while you have to set it to the transport.read.url property. Furthermore, depending on your .json file, you will have to set a value to the schema.data property to specify where the array of data in your .json file is.
If you have any comments about the suggestion and the results, post in the support thread if this is fine by you, so we avoid double postings.