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دة الخطأ ارجو الإفادة

Server Error in '/' Application.

Security Exception

Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityE xception: Request for the permission of type 'System.Net.WebPermission , System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c5619 34e089' failed.

Source Error:

[No relevant source lines]
Source File: App_Web_gtqwwin6.4.cs Line: 0

Stack Trace:

[SecurityException: Request for the permission of type 'System.Net.WebPermission , System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c5619 34e089' failed.]
System.Net.WebClient.Down loadDataInternal(Uri address, WebRequest& request) +287
System.Net.WebClient.Down loadData(Uri address) +106
System.Net.WebClient.Down loadData(String address) +29
sitemapbuilder.Processor. UrlList(String url) +184
sitemapbuilder.WebForm2.B utton2_Click(Object sender, EventArgs e) +234
System.Web.UI.WebControls .Button.OnClick(EventArgs e) +111
System.Web.UI.WebControls .Button.RaisePostBackEven t(String eventArgument) +110
System.Web.UI.WebControls .Button.System.Web.UI.IPo stBackEventHandler.RaiseP ostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaiseP ostBackEvent(IPostBackEve ntHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaiseP ostBackEvent(NameValueCol lection postData) +36
System.Web.UI.Page.Proces sRequestMain(Boolean includeStagesBeforeAsyncP oint, Boolean includeStagesAfterAsyncPo int) +6785
System.Web.UI.Page.Proces sRequest(Boolean includeStagesBeforeAsyncP oint, Boolean includeStagesAfterAsyncPo int) +242
System.Web.UI.Page.Proces sRequest() +80
System.Web.UI.Page.Proces sRequestWithNoAssert(Http Context context) +21
System.Web.UI.Page.Proces sRequest(HttpContext context) +49
ASP.default_aspx.ProcessR equest(HttpContext context) in App_Web_gtqwwin6.4.cs:0
System.Web.CallHandlerExe cutionStep.System.Web.Htt pApplication.IExecutionSt ep.Execute() +181
System.Web.HttpApplicatio n.ExecuteStep(IExecutionS tep step, Boolean& completedSynchronously) +75