Kendo UI scheduler not showing json data - kendo-ui

Question

I have a kendo UI scheduler that makes a ajax call and receives 2 json records through the read method. This is my scheduler widget.
$("#scheduler").kendoScheduler({
date: new Date(),
startTime:time ,
height: kendo.support.mobileOS.wp ? "28em" : 600,
views: [
{ type: "day", selected: true },
{ type: "week", selectedDateFormat: "{0:ddd,MMM dd,yyyy} - {1:ddd,MMM dd,yyyy}" },
"month",
{ type: "agenda", selectedDateFormat: "{0:ddd, M/dd/yyyy} - {1:ddd, M/dd/yyyy}" },
],
mobile: "phone",
datasource:{
batch: true,
transport: {
read: {
url: "http://mydomain.com/api/Schedule/Tasks_Read",
dataType: "jsonp"
},
update: {
url: "http://demos.telerik.com/kendo-ui/service/meetings/update",
dataType: "jsonp"
},
create: {
url: "http://demos.telerik.com/kendo-ui/service/meetings/create",
dataType: "jsonp"
},
destroy: {
url: "http://demos.telerik.com/kendo-ui/service/meetings/destroy",
dataType: "jsonp"
},
parameterMap: function(options, operation) {
if (operation !== "read" && options.models) {
return {models: kendo.stringify(options.models)};
}
}
},
schema: {
data:"Data",
model: {
id: "AppointmentId",
fields: {
//meetingID: { from: "MeetingID", type: "number" },
title: { from: "Title", defaultValue: "No title", validation: { required: true } },
start: { type: "date", from: "Start" },
end: { type: "date", from: "End" },
startTimezone: { from: "StartTimezone" },
endTimezone: { from: "EndTimezone" },
description: { from: "Description" },
//recurrenceId: { from: "RecurrenceID" },
recurrenceRule: { from: "RecurrenceRule" },
recurrenceException: { from: "RecurrenceException" },
//roomId: { from: "RoomID", nullable: true },
//atendees: { from: "Atendees", nullable: true },
isAllDay: { type: "boolean", from: "IsAllDay" },
//professionalId:{type:"string", from: "ProfessionalId", defaultValue=""},
//professionalName:{type:"string", from: "ProfessionalName"},
//clientId:{type:"string", from: "ClientId", defaultValue=""},
//clientName:{type:"string", from: "ClientName"}
}
}
}
}
})
I have 2 problems
the problem is that the records are not displayed on the scheduler
When i un-comment out my custom properties in the schema design the code when i compile the code it errors.
UPDAE
The json server response looks like
"{\"AppointmentId\":30,\"ClientId\":\"b26d9cc1-ddcc-4277-a4eb-61835c83fb48\",\"ClientName\":\"beast client\",\"ProfessionalId\":\"260f0c43-7ff9-4654-af2b-5df2f5b8d6a1\",\"ProfessionalName\":\"AutoFirstName AutoLastName\",\"Start\":\"2014-03-30T07:00:00\",\"End\":\"2014-03-30T07:30:00\",\"ColorUsed\":null,\"HairStyleId\":null,\"Title\":\"beast client Haircut \",\"Description\":\"beast client Haircut\",\"InactiveReasonDate\":null,\"InactiveReasonId\":null,\"IsAllDay\":false,\"StartTimezone\":null,\"EndTimezone\":null,\"RecurrenceRule\":null,\"RecurrenceException\":null,\"ClientRating\":null},{\"AppointmentId\":31,\"ClientId\":\"b26d9cc1-ddcc-4277-a4eb-61835c83fb48\",\"ClientName\":\"beast client\",\"ProfessionalId\":\"260f0c43-7ff9-4654-af2b-5df2f5b8d6a1\",\"ProfessionalName\":\"AutoFirstName AutoLastName\",\"Start\":\"2014-03-31T07:00:00\",\"End\":\"2014-03-31T07:30:00\",\"ColorUsed\":null,\"HairStyleId\":null,\"Title\":\"beast client Haircut\",\"Description\":\"beast client Haircut \",\"InactiveReasonDate\":null,\"InactiveReasonId\":null,\"IsAllDay\":false,\"StartTimezone\":null,\"EndTimezone\":null,\"RecurrenceRule\":null,\"RecurrenceException\":null,\"ClientRating\":null}"