Upgrade from vs2008 to vs2020 problem

[Former Member]

I recently upgraded my local machine from vs2008 to vs2010 and I'm having some problems with any page that uses the CrystalReports ReportViewer.

I'm recieving the error:

CS0433: The type 'CrystalDecisions.Web.CrystalReportViewer' exists in both

'c:\Windows\assembly\GAC_MSIL\CrystalDecisions.Web\13.0.2000.0__692fbea5521e1304\CrystalDecisions.Web.dll' and 'c:\Windows\assembly\GAC_MSIL\CrystalDecisions.Web\10.5.3700.0__692fbea5521e1304\CrystalDecisions.Web.dll'

My web.config only has references to the new 13.0.2000.0 as does the .aspx page containing the report viewer.

I was reading another similar thread , but the solution listed (remove all references, remove the report viewer, then add all the references and report viewer back) didn't work for me.

Any help would be much appreciated.

[Former Member · Accepted solution]

I decided to uninstall CR and te CR runtime, and it looks like I had two different run times installed (probably a 10.5 and a 13.0).

After reinstalling CR and the runtime, it's working great.

[former_member183750]

Just for anyone following this thread or hitting on it in the future. This is a known issue documented in KB 1544693 and

1544532 (use the search box in the top right corner of this web page).

- Ludek