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"Class not registered" exception while executing example project .NET Core

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05 Feb 2021 14:32 #9400 by support
Great - thanks for letting me know.

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05 Feb 2021 12:12 #9399 by Alexander Flekler
Thank you, the installation of the OPC Core Components Redistributable resolved the issue.

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05 Feb 2021 10:37 #9397 by support
Hello,
thank you for your interest in our products.

Can you please install OPC Core Components - opcfoundation.org/developer-tools/samples-and-tools-classic/core-components/ (from the MSI) and check if that helps?

Best regards
The following user(s) said Thank You: Alexander Flekler

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05 Feb 2021 09:17 #9396 by Alexander Flekler
Yesterday, I installed the QuickOPC 2020.3 and started paying with C# example projects. While the .NET examples from the solution QuickOpcCSharpExamples worked fine, I the example project MultiTargetDocExamples.csproj of the QuickOpcCSharpMultiTargetExamples generated "Class not registered" exception after it was executed.

Here is the complete exception text:
{OpcLabs.EasyOpc.Engine.NetApiException: An exception with error ID 'OpcLabs.EasyOpc.Engine.NetApiException' occurred during processing in a NET API OPC Data Access client. The inner exception contains details about the problem.
+ The client method called was 'ReadMultipleItems'. ---> OpcLabs.EasyOpc.Engine.NetApiException: An exception with error ID 'ErrorCode=0x80004005' occurred during processing in a NET API OPC Data Access client. The inner exception contains details about the problem. ---> System.Runtime.InteropServices.ExternalException: CoCreateInstanceEx: Class not registered
 
   at Opc.Server.Connect(URL url, ConnectData connectData)
   at Opc.Da.Server.Connect(URL url, ConnectData connectData)
   at OpcLabs.EasyOpc.Implementation.NetApi.DataAccess.NetApiOpcDaServer.ServerConnect(Server server, ConnectData connectData, Exception& exception)
   --- End of inner exception stack trace ---
   at OpcLabs.EasyOpc.Implementation.NetApi.DataAccess.NetApiOpcDaServer.ConnectToServer(WebProxy proxy, Server server, NetworkCredential credentials, String connectionGroupName, EasyDAAdaptableParameters adaptableParameters)
   at OpcLabs.EasyOpc.Implementation.NetApi.DataAccess.NetApiOpcDaServer.Connect(Boolean doOnlyIfGoodStatus, Boolean callGetStatus, Exception& exception)
   --- End of inner exception stack trace ---}

I have also checked the Registry for CLSID {C8A12F17-1E03-401E-B53D-6C654DD576DA}, it looks as followed
HKEY_CLASSES_ROOT\OPCLabs.KitServer\CLSID
HKEY_CLASSES_ROOT\WOW6432Node\CLSID\{C8A12F17-1E03-401E-B53D-6C654DD576DA}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\OPCLabs.KitServer
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\WOW6432Node\CLSID\{C8A12F17-1E03-401E-B53D-6C654DD576DA}
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Classes\CLSID\{C8A12F17-1E03-401E-B53D-6C654DD576DA}

Please advice me how to resolve the issue with .NET Core because I am going to develop in .NET Core and not .NET classic framework.

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