title: Using different versions of Crystal Reports on a same server
body: <p>I have a few web applications running on the same server. Recently I added crystal reports for VS 2010. I thought to use new reports for several of projects but not all. Other projects uses the older version of crystal reports</p>
  
  <p>So I modified the web.config of the required projects. I downloaded runtime on both my development machine and server. So now I have both versions of asseblies (v 10 and v 13) in GAC. I have .NET 4.0 on both macines as well.</p>
  
  <p>It has worked on development machine</p>
  
  <p>However, when I run the same projects on server it raises an error. </p>
  
  <p>CS0433: The type 'CrystalDecisions.CrystalReports.Engine.ReportClass' exists in both 'c:\WINDOWS\assembly\GAC_MSIL\CrystalDecisions.CrystalReports.Engine\10.5.3700.0__692fbea5521e1304\CrystalDecisions.CrystalReports.Engine.dll' and 'c:\WINDOWS\assembly\GAC_MSIL\CrystalDecisions.CrystalReports.Engine\13.0.2000.0__692fbea5521e1304\CrystalDecisions.CrystalReports.Engine.dll'</p>
  
  <p>I am wondering why it works on my development machine and does not on server ? Do I have to configure something on server to make it happen ? Or do I need to add in someting in web.config file ?</p>
  
  <p>If someknow knows it, please let me know.</p>
  
  <p>Thanks in advance for your help.</p>