Upgrade solution to latest version error

[Stefania]

Hi
I just update my project to the latest version of telerik reporting and I have the following error:

Descrizione: Errore durante la compilazione di una
risorsa necessaria per soddisfare la richiesta. Rivedere i dettagli
relativi all'errore e modificare in modo appropriato il codice sorgente.

Messaggio di errore del compilatore: CS0433: Il tipo
'Telerik.ReportViewer.WebForms.ReportViewer' esiste sia in
'c:\Windows\Microsoft.NET\assembly\GAC_MSIL\Telerik.ReportViewer.WebForms\v4.0_8.0.14.507__a9d7983dfcc261be\Telerik.ReportViewer.WebForms.dll'
che in 'c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary
ASP.NET
Files\root\cf8628da\ce2d5566\assembly\dl3\686b1289\00f0b81e_7632cf01\Telerik.ReportViewer.WebForms.DLL'


Errore nel codice sorgente:

Riga 413:
Riga 414: [System.Diagnostics.DebuggerNonUserCodeAttribute()]
Riga 415: private global::Telerik.ReportViewer.WebForms.ReportViewer @__BuildControlReportViewer1() {
Riga 416: global::Telerik.ReportViewer.WebForms.ReportViewer @__ctrl;
Riga 417:

File di origine:
c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET
Files\root\cf8628da\ce2d5566\App_Web_reportswindow.aspx.cdcab7d2.gygoq2rf.0.cs

   Riga: 415


Thanks

[Stef]

Hi Stefania,

This is a generic error that occurs due to conflicts where an assembly is loaded for. For example check the following stackoverflow discussion: Conflict between GAC and Bin dll and the one from our public forums: Telerik.ReportViewer.WebForms.ReportViewer exists in both Temporary ASP.NET Files & GAC_MSIL Error.

The suggested in our forum upgrade is described in the Upgrading Telerik Reporting Projects help article.

Regards,
Stef
Telerik