title: What does the error mean: Path cannot be the empty string or all whitespace
body: <p>My project will parse XML file and do some job.</p>
  
  <p>If i'm inside VS 2005 and I run my project, it works fine.</p>
  
  <p>If i try to execute my project (console application / .exe) i got this error: </p>
  
  <p><strong>Path cannot be the empty string or all whitespace</strong></p>