User288213138 posted
Hi Aowek,
An unhandled exception of type 'System.IO.FileNotFoundException' occurred in Unknown Module.
Could not load file or assembly 'System.Runtime, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies
In your project, did you reference System.Runtime?
You can right click on the References, then look for the System.Runtime and select it In your project.
and you can also refer to this link about similar error. you can confirm the working directory is either empty or equal to the bin\debug directory and check dependencies.
https://stackoverflow.com/a/9729835
Best regards,
Sam