Recommended solutions based on your search
Check if there is no nexus running. If not, delete
checkState()is Static convenience methods that help a method or constructor check whether it was invoked correctly (whether its preconditions have been met). This occurs when the precondition does not met.
Solutions on the web
java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.gecko.driver system property; for more information, see
The latest version can be downloaded from