title: Configuration Error - Exception has been thrown by the target of an invocation
body: <p>I have built a custom membership provider that I have used in a previous asp.net mvc app with no problems.</p>
  
  <p>Now I am trying to use it in an asp.net webforms app and I keep getting Configuration Error - Exception has been thrown by the target of an invocation.</p>
  
  <p>There is no stack trace on error page and the breakpoint in my membership provider's constructor wont get hit. </p>
  
  <p>I have read that I need to check the inner exception to find out the true problem, but I'm having trouble getting to that point.</p>