title: Errors when processing RDLC reports
body: <p>I am getting the following error when doing load test of a page which renders a </p>
  
  <pre><code>An error occurred during local report processing. ---&gt; Microsoft.Reporting.DefinitionInvalidException: 
  The definition of the report 'Main Report' is invalid. ---&gt; 
  Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: 
  An unexpected error occurred while compiling expressions. Native compiler return value: ‘128’.
  </code></pre>
  
  <p>This page works fine initially and then fails.</p>
  
  <p>Any thoughts appreciated.</p>
  
  <p>I tried running the IIS under LocalSystem account. Still I am getting the same exception.</p>
  
  <p><strong>Update:
  I tracked this issue and found that the problem is caused when the Report Viewer compiles the report using Visual Basic compiler. To be more accurate, this error code is Windows Error code and not the Reporting Services error code (There are no child processes to wait for).
  I tried to reproduce the same scenario, but with no luck.</strong></p>