title: #error when summing numbers in report builder?
body: <p>I'm trying to sum some numbers up in a grouping, and sometimes a <code>#error</code> would show up instead of an actual number. I understand that this may happen when dividing by 0 or when there are nulls in the dataset, but in the dataset, I only see valid numbers. The numbers aren't large enough to cause an overflow, and I'm certain the expression is correct, as the <code>#error</code> only shows up for a particular combination of parameters.</p>
  
  <p>Is there another reason why I'm seeing the <code>#error</code> message?</p>
  
  <p>To be clear, the formula is <code>=Sum(Fields!Number.Value)</code></p>
  
  <p><strong>Edit:</strong> Any of the aggregation functions also result in this message.</p>