title: The tablix 'Tablix1' is invalid. The value for the DataSetName Property is missing - Help
body: <p>For some weird reason i can not run my report, when i try to preview i get this error:</p>
  
  <p>(PLEASE RIGHT CLICK THE IMAGE AND CHOOSE VIEW IMAGE TO SEE IT LARGE)</p>
  
  <p><img src="https://i.stack.imgur.com/AhYCp.jpg" alt="alt text"></p>
  
  <p>Here is how my tablix property looks like:</p>
  
  <p><img src="https://i.stack.imgur.com/dd6GB.jpg" alt="alt text"></p>
  
  <p>Any idea what to do? The current .rdl was copied from another one. I changed the newly copied .rdl values to match my needs. I always do that and works perfect, instead of creating the design from scratch every single time. </p>