Visual Studio 2010 Trial, Build Error "Object reference not set to an instance of an object"

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  I have a Visual Studio 2005 ASP.Net Project which i upgraded to Visual Studio 2010 and am using .NET Framework 4.0 as target output.

  All assembly referenced in my web.config are pointing to 4.0 assemblies

  I have 40 to 50 crysral reports in this project as well

  When i build my project it gives Build (web): Object reference not set to an instance of an object message in output window and compilation failes

  When i re-compile couple of times, the project at last complies succsessfully

  I tried upgrading the Crystal reports as well by editing them in VS2010 and save them with an upgrade, but the problem is still there.

  After investigating in this issue i found that there was following construct in my <compilation> section of web.config:

  <buildProviders>
          <add extension=".rpt" type="CrystalDecisions.Web.Compilation.RptBuildProvider, CrystalDecisions.Web, Version=14.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/>
        </buildProviders>

  When i comment this section, compilation completes in first go:

  Also if i add <clear/>, the problem goes away as well:

  <buildProviders>
          <clear/>
          <add extension=".rpt" type="CrystalDecisions.Web.Compilation.RptBuildProvider, CrystalDecisions.Web, Version=14.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304"/>
        </buildProviders>

   

  I am unable to locate the root cause till now, if any one had this issue and a solution is there, please let me know, Thanks.

  • Moved by Harry Zhu Tuesday, June 8, 2010 1:49 AM (From:Crystal Reports for Visual Studio)

  Tuesday, June 1, 2010 6:16 AM