pdf download error in grapecity active reports using jquery ajax json

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ASP.NET

Ajax

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JSON

Hi,
This is my code. when i try to download pdf report i am getting the following error.
Anyone please help me.Thanks in advance
code:
$.ajax({

type: "POST",
contentType: "application/json; charset=utf-8",
url: ServiceUri + "LoadOnTimeReport",
data: '{"LocationId":"' + $("#cmbLocation option:selected").val() + '","Location":"' + $("#cmbLocation option:selected").text() + '","statuschangeddatefrom":"' + $("#txtStatusChangeFromDate").val() + '","statuschangedateto":"' + $("#txtStatusChangeToDate").val() + '","exportType":"' + exportType + '"}',
dataType: "json",
success: function (data) {
$("#lblMessage").empty();
},
error: function (xhr, status, error) {

alert(xhr.responseText);
}

});

error:

%PDF-1.3
%??
1 0 obj
<<
/Type /Outlines
/Count 0
>>
endobj
2 0 obj

[/PDF /Text /ImageC]
endobj
3 0 obj
<<
/Type /Pages
/Count 1
/Kids [10 0 R ]
>>
endobj
4 0 obj
<<
/Type /Font
/Subtype /TrueType
/Name /F1
/BaseFont /Arial,Bold
/FirstChar 32
/LastChar 255
/Widths [