java.lang.RuntimeException: Could not start Selenium session: Failed to start new browser session: org.openqa.selenium.server.RemoteCommandException: Error while launching browser

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Could not contact Selenium Server; have you started it on 'localhost:4444' ? Read more at http://seleniumhq.org/projects/remote-control/not-started.html Connection refused: connect
java.lang.RuntimeException: Could not start Selenium session: Failed to start new browser session: org.openqa.selenium.server.RemoteCommandException: Error while launching browser
at com.thoughtworks.selenium.HttpCommandProcessor.throwAssertionFailureExceptionOrError(HttpCommandProcessor.java:112)
at com.thoughtworks.selenium.HttpCommandProcessor.doCommand(HttpCommandProcessor.java:106)
at com.thoughtworks.selenium.HttpCommandProcessor.getString(HttpCommandProcessor.java:275)
at com.thoughtworks.selenium.HttpCommandProcessor.start(HttpCommandProcessor.java:237)

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