Exception in thread "main" java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.gecko.driver system property; for more information, see https://github.com/mozilla/geckodriver. The latest version can be downloaded from https://github.com/mozilla/geckodriver/releases
at com.google.common.base.Preconditions.checkState(Preconditions.java:847)
at org.openqa.selenium.remote.service.DriverService.findExecutable(DriverService.java:134)
at org.openqa.selenium.firefox.GeckoDriverService.access$100(GeckoDriverService.java:44)
at org.openqa.selenium.firefox.GeckoDriverService$Builder.findDefaultExecutable(GeckoDriverService.java:167)
at org.openqa.selenium.remote.service.DriverService$Builder.build(DriverService.java:355)
at org.openqa.selenium.firefox.FirefoxDriver.toExecutor(FirefoxDriver.java:190)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:147)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:125)
at TesteAutomatizado.main(TesteAutomatizado.java:10)
Alguém pode me ajudar ? Não sei onde estou errando.