title: How to read a stack trace in ASP.NET NullReferenceException message
body: <p>i have a code that is giving me a "NullReferenceException" in the production environment but in the development environment works fine.
  So, i want to know how to understand this class of exceptions and read correctly the message that is being throw to my client.
  Where is the critical information in the message?
  If you see the image, the arrow number 1 i think is the main method where the error is being throw but then i see "+0", what's that mean? and what are the next arrow lines means?
  <img src="https://i.stack.imgur.com/nFXkq.png" alt="enter image description here"></p>