title: SSRS: Operator '-' is not defined for types 'Object' on Deploy
body: <p>I have peculiar problem: when I'm trying to deploy  my report, I get the following error:</p>
  
  <blockquote>
    <p>Error 1   An unexpected error occurred while compiling expressions.
    Native compiler return value: ‘[BC30452] Operator '-' is not defined
    for types 'Object' and
    'Microsoft.ReportingServices.ReportProcessing.ReportObjectModel.Field'.’.     0   0</p>
  </blockquote>
  
  <p>However when I build and Run (or preview) the report no error occurs and it works.</p>
  
  <p>My question is:</p>
  
  <ol>
  <li>What could cause this?</li>
  <li>How to trace the error, since it works on Visual Studio environment?</li>
  </ol>