When I try to open the designer in visual studio I get the following error:
Value cannot be null. Parameter name: instance
I tried reinstalling the latest version of reporting but that did not fix it.
The designer worked before, the error began happening randomly one day.
1 Answer, 1 is accepted
answered on 06 Aug 2019, 01:54 PM
Hi Darin and Jonathan,
I'm sorry to hear that you are experiencing issues with our product.
The error Value cannot be null. Parameter name: instance can occur due to different reasons: - Telerik Reporting extension might not be installed on the machine. Go to Extensions -> Manage extensions in Visual Studio and check for Telerik Reporting Tools; - the installed version of Telerik Reporting and the version used in the reports may differ. In this case, check whether the reports to be opened in the designer have the same version as the one installed on the computer. If not, you may use the Upgrade Wizard to upgrade or downgrade to the necessary version (must be installed on the machine). After running the Upgrade Wizard, restart Visual Studio. You can also delete the bin and obj folders and rebuild the project once again. - the project might use a version of Telerik Reporting that is not registered in Visual Studio. This might be due to Telerik Reporting being installed before the installation of Visual Studio 2017. For a solution, check Value cannot be null. Parameter name instance. when trying to open the Report Designer in Visual Studio 2017 KB article, which is also valid for Visual Studio 2019.
Check if the issue is reproducible with our demos which can be found atC:\Program Files (x86)\Progress\Telerik Reporting[Version]\Examples\CSharp, the reports are placed in CSharp.ReportLibrary project. In addition, make sure that the version of Telerik Reporting is compatible with the version of Visual Studio.
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