[CommonProperty, DataMember, Sortable, UserFriendlyDataType(UserFriendlyDataType.ShortText)]
.lastName = value;
var contactsGridView =
ViewName = ContactsDefinitions.BackendListViewName,
DisplayMode = FieldDisplayMode.Read,
ItemsPerPage = 50,
Could not deserialize service response, because it was empty or not a valid JSON.
It is clear that problem is with deserialization of web service response, but we need more information about the data that cause this issue at custom implementation.
Can you send us your configuration and database that can give us a clue what is the problem ?
Thanks in advance!