title: "#type!" error on report calculated field
body: <p>I have a report in Access with 3 fields on it: <code>Width</code>, <code>Height</code> and <code>Area</code>.<br>
   <code>Width</code> and <code>Height</code> are pulled from the table the report is bound to, whilst <code>Area</code> should be calculated (height * width). I've set the <code>Control Source</code> of the <code>Area</code> to <code>= [Height] * [Width]</code>, but on opening the form the field displays <code>#Type!</code>, in typically descriptive Access errors fashion, with nice use of <code>#</code> and <code>!</code> to make it impossible to accurately Google... but I digress. I have no idea what <code>#Type!</code> means and Access doesn't want to tell me.</p>
  
  <p>I can't understand this. In the bound table, <code>Height</code> and <code>Width</code> are Integers, and are both populated in the record being viewed (so it's not a <code>NULL</code> problem).  If I change the <code>Control Source</code> to something <em>really simple</em> - like <code>=[Height]</code>, it spits out <code>#Error!</code> instead (again, thanks for the useful intel, Access. We'd be lost without you). Even <code>= 1</code> spits out <code>#Error!</code>.</p>
  
  <p>Any idea why Access hates my control sources?</p>