CODEWITHSUNDEEP
c#seleniumselenium-chromedriver
sapbucket
sapbucket

Reputation: 7195

Selenium ChromeDriver "no such session" error

I am using:

I am seeing the following exception during website testing (this is my log4net entry):

FATAL2017-01-09 05:03:10 – no such session
  (Driver info: chromedriver=2.26.436362 (5476ec6bf7ccbada1734a0cdec7d570bb042aa30),platform=Windows NT 6.1.7601 SP1 x86_64)
FATAL2017-01-09 05:03:10 –    at OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError(Response errorResponse)
   at OpenQA.Selenium.Remote.RemoteWebDriver.Execute(String driverCommandToExecute, Dictionary`2 parameters)
   at OpenQA.Selenium.Remote.RemoteWebDriver.ExecuteScriptCommand(String script, String commandName, Object[] args)
   at OpenQA.Selenium.Remote.RemoteWebDriver.ExecuteScript(String script, Object[] args)

I start my driver session like this:

        var options = new ChromeOptions();
        options.AddArguments("test-type");          
        options.AddArgument("incognito"); // works
        options.AddArgument("--disable-bundled-ppapi-flash"); // works! this turns off shockwave
        options.AddArgument("--disable-extensions"); // works
        options.AddArguments("--start-fullscreen");
        var driver = new ChromeDriver(options);
        driver.Manage().Cookies.DeleteAllCookies();
        return driver;

And I navigate to a "new" tab in Chrome with the following command:

lock (Session.Driver)
{                
    JavaScriptExecutor jscript = Session.Driver as IJavaScriptExecutor;
    jscript.ExecuteScript(string.Format("window.open('{0}', '_blank');", url));
}

Which works in DEBUG 100% of the time. In RELEASE mode, I receive the error above. Which makes this a difficult problem to resolve...no debugger.

I have checked and the session is active, and at the point of entry two handles in Driver.WindowHandles corresponding to the tabs in Chrome are available. I have resorted to Console.Writeline() statements to view variables that I would normally diagnose in the watch window in visual studio debug mode.

I have been unable to reproduce this exception while debugging. It always "works" during debugging.

There are 5-10 other SO posts about the same issue. The answers to those questions involved updating the chromedriver.exe (I have the latest, and also tried older versions), or, are working with a different technology stack. There must be something else going on here.

Notes:

  1. I can reproduce this error every time in RELEASE mode. However in DEBUG mode it works every time (no error).
  2. I tried downgrading to chrome32_53.0.2785.116 (I uninstalled version 54) - same results no improvement.
  3. I checked which chrome driver I'm using for DEBUG: it is exactly the same chromedriver.exe used during RELEASE. (this leads me to conclude that neither Chrome, nor the Chrome driver, are the culprit).

Upvotes: 2

Views: 3646

Answers (2)

AlexK11
AlexK11

Reputation: 21

Found same error when running ChromeDriver in multithreading.

Try to add:

ChromeOptions chromeOptions = new ChromeOptions();
.....
chromeOptions.AddArgument("--disable-impl-side-painting"); //it worked for me
.....
var tmp = new ChromeDriver(service, chromeOptions);

Upvotes: 0

sapbucket
sapbucket

Reputation: 7195

I discovered that I had to remove "optimize code" setting from Project->Properties->Build->(Release Configuration)->uncheck "optimize code".

I do not know why the "optimize code" setting would cause this issue.

I cannot claim credit. I followed the instructions at this SO post for the solution. See Josh Berke's post.

Upvotes: 1

Related Questions