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Runtime exception at selenium.start() - Could not start Selenium session: Failed to start new browser session: Error while launching browser

private static HttpCommandProcessor proc;

    public static DefaultSelenium selenium;

 

    if (selenium == null) {

 

        proc = new HttpCommandProcessor("localhost", 4444, browserName,

                urlName);

        selenium = new DefaultSelenium(proc);

        **selenium.start();**

        selenium.setTimeout(String.valueOf(PAGE_TIMEOUT_TIME));

        selenium.useXpathLibrary("javascript-xpath");

        selenium.deleteAllVisibleCookies();            

    }

       

java.lang.RuntimeException: Could not start Selenium session: Failed to start new browser session: Error while launching browser

  at com.thoughtworks.selenium.DefaultSelenium.start(DefaultSelenium.java:107)

  at <package>.SuperClass.connectToUrl(SuperClass.java:340)