Regarding the provided information we are not sure what may be the reason for the problem you experience. Could you please send us more details about the error message and its stack trace? It will be best if it is possible to provide a live link to your application so that we can test it and investigate the problem.
For the moment I could suggest you try to remove the progress area and test whether the problem will persist or not. If the problem exists it will mean that the problem is probably due to some DB calls.
Looking forward to receiving your reply.
the Telerik team