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  7. Application using OPC Labs Easy UA Client is throwing a unhandled exception

Application using OPC Labs Easy UA Client is throwing a unhandled exception

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29 Aug 2018 14:30 #6623 by support
Replied by support on topic Application using OPC Labs Easy UA Client is throwing a unhandled exception
Hello,

can you show a piece of code that does the exception handling on calls to QuickOPC, or in the event handler? There are legitimate exceptions that can be thrown and cannot be fully prevented - for example, when the communication with the target OPC server breaks for any reason (server down, network problem etc.). This may be your case as well. The program needs to be written so that it handles these errors/exceptions properyl, and we have instructions for that - see e.g. opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...frame.html#Best_Practices.html .


Best regards

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29 Aug 2018 12:22 #6621 by alex.garnier@radixinc.ca
Application using OPC Labs Easy UA Client is throwing a unhandled exception was created by alex.garnier@radixinc.ca
OpcLabs.EasyOpc.UA.Engine.UAClientEngineException: Cannot lock the OPC-UA client session because it is not available.

This error shows up once in a blue moon and crashes the entire program. I can't recreate it and my debugging options are highly limited on a deployed machine. Its installed on a machine running production on a assembly line. What causes this error and how can I program around it? I can't find any details online.

Software/computer details:

* Running as a C# class library embedded into a cognex designer project.
* 64 bit windows embedded standard

Full error message:
 

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