I found solution here:
Excerpt from wordpress link:
I recevied this error while compiling my first C# production
application. I had to do the following in Visual Studio for the
project:
- In Solution Explorer, expand the References node and click the assembly listed in the error. Ensure Copy Local in the Properties grid
is set to ‘True’.- In the properties of the project, Publish | Application Files Tab, ensure the Publish Status for the assembly listed in the error is set
to ‘Include’