title: RDLC net 4.5.2. - Operation could destabilize the runtime
body: <p>When I try to export report in PDF/Excel/Word or print report, I got a error. Error description : </p>
  
  <pre><code>Server Error in '/' Application.
  
  Operation could destabilize the runtime. 
    Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 
  
   Exception Details: System.Security.VerificationException: Operation could destabilize the runtime.
  </code></pre>
  
  <p>Source Error: </p>
  
  <pre><code>An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
  </code></pre>
  
  <p>Stack Trace: </p>
  
  <pre><code>[VerificationException: Operation could destabilize the runtime.]
  
  [TypeInitializationException: The type initializer for 'System.Diagnostics.Activity' threw an exception.]
  
  [TargetInvocationException: Exception has been thrown by the target of an invocation.]
     System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +153
     System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData&amp; msgData, Int32 type) +336
     System.Collections.Generic.IList`1.get_Item(Int32 index) +0
     Microsoft.ReportingServices.ReportIntermediateFormat.TextBox.SetExprHost(ReportExprHost reportExprHost, ObjectModelImpl reportObjectModel) +101
     Microsoft.ReportingServices.OnDemandProcessing.OnDemandProcessingContext.RuntimeInitializeTextboxObjs(ReportItem reportItem, Boolean setExprHost) +74
     Microsoft.ReportingServices.OnDemandReportRendering.OnDemandPageEvaluation.InitializeEnvironment() +778
     Microsoft.ReportingServices.OnDemandReportRendering.OnDemandPageEvaluation..ctor(Report report) +84
     Microsoft.ReportingServices.OnDemandReportRendering.Report..ctor(Report reportDef, ReportInstance reportInstance, RenderingContext renderingContext, String reportName, String description) +100
     Microsoft.ReportingServices.ReportProcessing.Execution.RenderReportOdp.PrepareROM(RenderingContext&amp; odpRenderingContext) +158
     Microsoft.ReportingServices.ReportProcessing.Execution.RenderReport.Execute(IRenderingExtension newRenderer) +306
  
  [LocalProcessingException: An error occurred during local report processing.]
     Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, PageCountMode pageCountMode, CreateAndRegisterStream createStreamCallback, Warning[]&amp; warnings) +166
     Microsoft.Reporting.WebForms.LocalModeSession.RenderReport(String format, Boolean allowInternalRenderers, String deviceInfo, NameValueCollection additionalParams, Boolean cacheSecondaryStreamsForHtml, String&amp; mimeType, String&amp; fileNameExtension) +193
     Microsoft.Reporting.WebForms.ExportOperation.PerformOperation(NameValueCollection urlQuery, HttpResponse response) +514
     Microsoft.Reporting.WebForms.HttpHandler.ProcessRequest(HttpContext context) +250
     System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +188
     System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +69
  
  Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1087.0
  </code></pre>
  
  <p>Any ideas.
  Thanks. </p>