how to fix "'System.AggregateException' occurred in mscorlib.dll"
<p>I receive such problem in debugger and program stops executing. Debugger doesn't show me the line so I don't know what to fix.</p>

<blockquote>
  <p>An unhandled exception of type 'System.AggregateException' occurred in
  mscorlib.dll</p>
  
  <p>Additional information: A Task's exception(s) were not observed either
  by Waiting on the Task or accessing its Exception property. As a
  result, the unobserved exception was rethrown by the finalizer thread.</p>
  
  <p>Cannot obtain value of local or argument '' as it is not
  available at this instruction pointer, possibly because it has been
  optimized away.   System.Threading.Tasks.TaskExceptionHolder</p>
</blockquote>

<p>How to troubleshoot my problem?</p>

<p>I also found this question which is pretty similar <a href="http://stackoverflow.com/questions/8311303/cannot-obtain-value-of-local-or-argument-as-it-is-not-available-at-this-instruct">Cannot obtain value of local or argument as it is not available at this instruction pointer, possibly because it has been optimized away</a></p>
