I am using selenium, Specflow and nUnit to run automated tests with visual studio. The code was working with visual studio 2010. After I installed visual studio 2012, selenium and Specflow again (I think I did it right), it stopped working. First, the steps didn't recognize their definitions and I think I fix it writing [Binding] in all the c# files that contains their definitions. Now when I try to build the project it shows an error that I can't solve to all feature files.
It shows 50 errors (the same number of Specflow feature files I have), they are all the same, and it says this:
Error: Generation error: SpecFlow configuration error -> The element <unitTestProvider> may only appear once in this section.
I don't know how to fix this. I hope somebody can help me, I am really worry because of this.
Keep only one attribute as unitTestProvider name="SpecRun" or unitTestProvider name="NUnit" in app.config
This error is caused by two 'unitTestProviders' in app.config.
After I install-Package SpecRun.SpecFlow -Version 1.2.0,
I've got 2 entries unitTestProvider name="SpecRun" and unitTestProvider name="NUnit" in app.config, that coused the error.
It should be manually changed to combined one
<unitTestProvider name="SpecRun+NUnit" />
来源：https://stackoverflow.com/questions/14898006/error-with-specflow-in-visual-studio-2012-with-unittestprovider