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21/01/2019 by Kvaser

When I use function, there is an error

I’m using visual studio 2015 C#. I’m making windows form application. but when I call function, an error is appeared. The error message is like this

Unhandled exception has occurred in a component in your application. If you click Continue, the application will ignore this error and attempt to continue.

How can I solve this problem??
Thank you