title: Could not start Selenium session: You may not start more than one session at a time
body: <p>this is a configuration error , when trying to configure selenium with eclipse , what i read in a couple of websites is that , adding a dependency to maven would do , but nothing worked  , i have been spending a lot of hours/day , even modified the system property , to add firefox profile into it , but nothing worked . looks like i am the first one on this earth to get this error </p>
  
  <p>thankyou </p>
  
  <p>pasting a stack trace , for your reference 
  java.lang.RuntimeException: Could not start Selenium session: You may not start more than one session at a time
      at com.thoughtworks.selenium.DefaultSelenium.start(DefaultSelenium.java:90)
      at TestAddVisitor.setUp(TestAddVisitor.java:36)
      at junit.framework.TestCase.runBare(TestCase.java:132)
      at com.thoughtworks.selenium.SeleneseTestCase.runBare(SeleneseTestCase.java:228)
      at junit.framework.TestResult$1.protect(TestResult.java:110)
      at junit.framework.TestResult.runProtected(TestResult.java:128)
      at junit.framework.TestResult.run(TestResult.java:113)
      at junit.framework.TestCase.run(TestCase.java:124)
      at junit.framework.TestSuite.runTest(TestSuite.java:232)
      at junit.framework.TestSuite.run(TestSuite.java:227)
      at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
      at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
      at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
  Caused by: com.thoughtworks.selenium.SeleniumException: You may not start more than one session at a time
      at org.openqa.selenium.WebDriverCommandProcessor.start(WebDriverCommandProcessor.java:217)
      at org.openqa.selenium.WebDriverCommandProcessor.start(WebDriverCommandProcessor.java:208)
      at com.thoughtworks.selenium.DefaultSelenium.start(DefaultSelenium.java:82)
      ... 16 more</p>