at com.google.common.base.Preconditions.checkState(Preconditions.java:199)
at org.openqa.selenium.remote.service.DriverService.findExecutable(DriverService.java:109)
at org.openqa.selenium.firefox.GeckoDriverService.access$000(GeckoDriverService.java:37)
at org.openqa.selenium.firefox.GeckoDriverService$Builder.findDefaultExecutable(GeckoDriverService.java:95)
at org.openqa.selenium.remote.service.DriverService$Builder.build(DriverService.java:296)
at org.openqa.selenium.firefox.FirefoxDriver.createCommandExecutor(FirefoxDriver.java:277)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:247)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:242)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:238)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:127)
at SELENIUM_17.main(SELENIUM_17.java:10)