1528503 - CRVS2010 - Microsoft JScript runtime error: 'Sys.Application' is null or not an object

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1528503 - CRVS2010 - Microsoft JScript runtime error: 'Sys.Application' is null or not an object


  • Running a web application with the Crystal Reports viewer on a Master page
  • Results in the error: 'Sys.Application' is null or not an object
  • The error occurs in the crv.js file at:
If(Typeof(Sys)! == 'undefined') {
  • This error occurs at compile time and can be ignored



  • Microsoft Visual Studio .NET 2010
  • Crystal Reports 2010 for VS 2010

Reproducing the Issue

  • Create a new Web project in VS 2010
  • Add the Crystal Reports for VS 2010 viewer to a Master Page
  • Run this project


  • Microsoft AJAX controls are interfering with the Viewer rendering
  • Note that if an .aspx page has other .NET controls that use Microsoft AJAX, then this error will occur


  • Open the js file and find the last "if" statement in the file
  • Modify the crv.js file so it reads;
if(typeof(Sys) !== 'undefined' && typeof(Sys.Application) !== 'undefined') {
  • Note that there are two crv.js files and both must be modified:



  • Alternatively, use a Try / Catch block
  • This issue is being tracked under ADAPT01496652


KBA , BI-DEV-NET , BI Software Development Kits (SDKs) - .NET or Other , Problem


SAP Crystal Reports, developer version for Microsoft Visual Studio