Selenium - Could not start Selenium session: Failed to start new browser session: Error while launching browser

I am new to Selenium. I generated my first java selenium test case and it has compiled successfully. But when I run that test I got the following RuntimeException

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:88>

Kindly tell me how can I fix this error.

This is the java file I want to run.

import com.thoughtworks.selenium.*;

import java.util.regex.Pattern;

import junit.framework.*;

public class orkut extends SeleneseTestCase {

 public void setUp() throws Exception {

  setUp("https://www.google.com/", "*chrome");

 }
 public void testOrkut() throws Exception {

  selenium.setTimeout("10000");

  selenium.open("/accounts/ServiceLogin?service=orkut&hl=en-US&rm=false&continue=http%3A%2F%2Fwww.orkut.com%2FRedirLogin%3Fmsg%3D0&cd=IN&skipvpage=true&sendvemail=false");

  selenium.type("Email", "username");

  selenium.type("Passwd", "password");

  selenium.click("signIn");

  selenium.selectFrame("orkutFrame");

  selenium.click("link=Communities");

  selenium.waitForPageToLoad("10000");

 }

 public static Test suite() {

  return new TestSuite(orkut.class);

 }

 public void tearDown(){

  selenium.stop();

 }

 public static void main(String args[]) {

  junit.textui.TestRunner.run(suite());

 }

}

I first started the selenium server through the command prompt and then execute the above java file through another command prompt.

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