title: What does the message following error message in visual studio mean?
body: <p>So I am creating a multi-threaded C++ program and it returns this error:</p>
  
  <blockquote>
    <p>Unhandled exception at 0x77e915de in HANASimulationSync.exe:
    0xC0000005: Access violation reading location 0x00000020.</p>
  </blockquote>
  
  <p>By the way, when I run this code in a single thread it doesn't return any errors.  I'd just like to know what sort of error is this?  Does it have something to do with memory management?</p>