Microsoft Edge WebDriver - Unexpected error. Unknown error

Question

I am getting the following exception when trying to get Microsoft Edge automation to work with Selenium:

OpenQA.Selenium.WebDriverException: Unexpecte

Answer 1

I know you mentioned you had the same versions, but I was getting the same error myself and this is how I resolved it so hopefully this helps.

It appears that Microsoft is no longer releasing the Web Driver as a standalone version, which may be the issue. (See here for more details) Currently, Edge seems to be at version 17763, whereas the NuGet package is 17134. So what I had to do was go in and "install it as a standalone by going to Settings > Apps > Apps & features > Manage optional features." There are some alternative directions that are included in the link above.

Once that installed I pointed the driver to the location and it finally worked.

var driver = new EdgeDriver("C:\\Windows\\System32\\", edgeOptions);

Answer 2

I'm not sure how or why, but this worked for me, also. I was getting the pesky "Message: OpenQA.Selenium.WebDriverException : Unexpected error. Unknown error".

I followed Brian Murphy's instructions to install Microsoft Edge Driver as a Standalone by managing my optional features. I don't know where windows installed it, and I didn't need to change any of my code in C#, and my test which was previously failing at Driver = new EdgeDriver(edgeService, options);

once again started to pass.