I am using ImageGallery control of FreeTextbox DLL for uploading images to server.
The issue i am facing is when i click on upload button this error page is shown
I Check the console of chrome, i got following error
here is my aspx code of ftb.imagegallery.aspx
<%@ Register TagPrefix="FTB" Namespace="FreeTextBoxControls" Assembly="FreeTextBox, Version=3.3.1.12354, Culture=neutral, PublicKeyToken=5962a4e684a48b87" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<FTB:ImageGallery ID="ImageGallery1"
AllowImageDelete="true" JavaScriptLocation="InternalResource" UtilityImagesLocation="InternalResource"
AllowImageUpload="true" AllowDirectoryCreate="true" AllowDirectoryDelete="true" runat="Server" />
</div>
</form>
</body>
</html>

I didn't able to solve this issue, Alternatively I manage to get past to this problem by manual uploading the image using A
FileUploadControll. Here is my code for anyone who face this problem in future.1.ftb.imagegallery.aspx
2.Code behind