Some additional text:

This exception was originally thrown at this call stack:
System.Security.Cryptography.CryptographicException.ThrowCryptographicException(int)
System.Security.Cryptography.X509Certificates.X509Utils.LoadCertFromBlob(byte[], System.IntPtr, uint, bool, System.Security.Cryptography.X509Certificates.SafeCertContextHandle)
System.Security.Cryptography.X509Certificates.X509Certificate.LoadCertificateFromBlob(byte[], object, System.Security.Cryptography.X509Certificates.X509KeyStorageFlags)
System.Security.Cryptography.X509Certificates.X509Certificate2.X509Certificate2(byte[], string, System.Security.Cryptography.X509Certificates.X509KeyStorageFlags)
Opc.Ua.CertificateFactory.Load(System.Security.Cryptography.X509Certificates.X509Certificate2, bool)
Opc.Ua.CertificateIdentifier.Find(bool)
Opc.Ua.Configuration.ApplicationInstance.CheckApplicationInstanceCertificate(bool, ushort)
OpcLabs.EasyOpc.UA.Toolkit.UAClientEngineBase.ValidateOrCreateClientCertificate.AnonymousMethod__2()
OpcLabs.EasyOpc.UA.Toolkit.UAEngineBase.PerformSdkAction(OpcLabs.EasyOpc.UA.Toolkit.UASdkCallType, System.Func<System.IDisposable>, string, System.Action)

Ok, thanks:

The inner exception is:
CryptographicException: The specified network password is not correct.

Hello,

I am somewhat confused, because you have written that you are doing debugging in Visual Studio. With that, it should be possible to have it break into the debugger when the exception is thrown, and then inspect it.

If Visual Studio is not doing it by itself:

1. In VS, do Debug -> Windows -> Exception settings.
2. In "Exception Settings" window, right-click "Common Language Runtime Exceptions" and select "Add".
3. Type OpcLabs.EasyOpc.UA.OperationModel.UAException and press Enter.
4. Run the program (Debug -> Start Debugging).

Hopefully it will now break into the debugger.

Best regards

I can nog get the inner exception as the app crashes constantly. Do you have any advice to get it?

What I can see in the windows eventviewer if I run the build .exe is the following:

Faulting application name: hmiver005.exe, version: 5.0.0.0, time stamp: 0x60b88b62
Faulting module name: ntdll.dll, version: 10.0.19041.964, time stamp: 0xb7db0838
Exception code: 0xc0000374
Fault offset: 0x000e6b83
Faulting process id: 0x279c
Faulting application start time: 0x01d7584e476cff00
Faulting application path: \\HMI\hmi\bin\Release\hmiver005.exe
Faulting module path: C:\WINDOWS\SYSTEM32\ntdll.dll
Report Id: 76393a56-1d1f-46c4-bd6e-c34a31d39eb0
Faulting package full name:
Faulting package-relative application ID:

Hello.

Can you please provide the text of the inner exception (the CryptographicException) as well?
Thank you

Dear opc labs admin,

I am working on an application I build several years ago, with QuickOPC 2016.2 al written in C#. The application was running fine during debugging in Visual Studio.
I wanted to cange some code and do debugging this week and ran into this error which crashes the application all the time:

Exception thrown: 'OpcLabs.EasyOpc.UA.OperationModel.UAException' in mscorlib.dll
An OPC-UA operation failure with error code -1 (0xFFFFFFFF) occurred, originating from 'mscorlib'. The inner exception, of type 'System.Security.Cryptography.CryptographicException', contains details about the problem.

When I remove all EasyUAClient objects, the application runs fine. Does this have something to do with windows certificates? Could you please guide me in resolving this issue? Support will be highly appreciated.

Im am using Visual Studio 2015 (VS 2019 gives the same issues)

Carsten