InvalidOperationException: Failed to start browser C:\Program Files\Mozilla Firefox\firefox.exe: other os error (SessionNotCreated)

[johnny0618]

It runs very well on other machine with same win 10,but it does occurs in this machine.

System

• Version: geckodriver-v0.25.0-win64
• Platform: Win 10
• Firefox: 69.0.1 (64)
• Selenium: 3.141

Testcase

    FirefoxOptions options = new FirefoxOptions();
    options.BrowserExecutableLocation="C:\\Program Files\\Mozilla Firefox\\firefox.exe"; 
    options.LogLevel = FirefoxDriverLogLevel.Trace;
    string driverPath = FileUtil.getFileAssetsPath() + "Core\\Tools";
    IWebDriver driver=null;

    driver = new FirefoxDriver(driverPath, options); //<-Add your path

Stacktrace

InvalidOperationException: Failed to start browser C:\Program Files\Mozilla Firefox\firefox.exe: other os error (SessionNotCreated)
OpenQA.Selenium.Remote.RemoteWebDriver.UnpackAndThrowOnError (OpenQA.Selenium.Remote.Response errorResponse)
OpenQA.Selenium.Remote.RemoteWebDriver.Execute (System.String driverCommandToExecute, System.Collections.Generic.Dictionary`2 parameters)
OpenQA.Selenium.Remote.RemoteWebDriver.StartSession (ICapabilities desiredCapabilities)
OpenQA.Selenium.Remote.RemoteWebDriver..ctor (ICommandExecutor commandExecutor, ICapabilities desiredCapabilities)
OpenQA.Selenium.Firefox.FirefoxDriver..ctor (OpenQA.Selenium.Firefox.FirefoxDriverService service, OpenQA.Selenium.Firefox.FirefoxOptions options, TimeSpan commandTimeout)
OpenQA.Selenium.Firefox.FirefoxDriver..ctor (System.String geckoDriverDirectory, OpenQA.Selenium.Firefox.FirefoxOptions options, TimeSpan commandTimeout)
OpenQA.Selenium.Firefox.FirefoxDriver..ctor (System.String geckoDriverDirectory, OpenQA.Selenium.Firefox.FirefoxOptions options)

Trace-level log

See https://searchfox.org/mozilla-central/source/testing/geckodriver/doc/TraceLogs.md
for how to produce a trace-level log.

Sorry I have added options.LogLevel = FirefoxDriverLogLevel.Trace; but got no trace

[andreastt]

I suspect this may be related to #1617. Could you try install the Visual Studio Redistributable Runtime and see if that makes a difference?

[johnny0618]

It works!Thank you!

[whimboo]

Please note that this is a bug in geckodriver 0.25.0. The dependency on the MSVC runtime package will be removed again with the 0.26.0 release.

Marking as dupe of issue #1617

[lock]

This issue has been automatically locked since there has not been any recent activity after it was closed. If you have run into an issue you think is related, please open a new issue.