title: Ado.Net Entity Data Model Not Updating Correctly
body: <p>I've done the following steps: 
  - Open visual studio<br>
  - Create new item<br>
  - Select "ADO.Net Entity Data Model"<br>
  - Point it to an existing database<br>
  - Accept all the defaults.<br>
  - It then adds a "Model1.edmx" file to my solution and the corresponding "Model1.Designer.cs" file.   </p>
  
  <p>However in the output I get the following error:<br>
  "ERROR: Unable to generate model because of the following exception: 'Value does not fall within the expected range.'."</p>
  
  <p>I've created a model from this database before so I dont think the error is a result of complex table design (which it's not). </p>
  
  <p>Has anyone else hit this error? </p>
  
  <p>Thanks</p>