Webdriver execution is not working (Webdriverexception) is given - selenium-webdriver

Question

I have written a very basic script to just login to an application and logout. The script stop working as soon as it logs in to the application and an exception is given and I cant figure out the reason for this. This is the script.
public class Login {
WebDriver driver = new FirefoxDriver();
String url = "http://xxxxxxxxx";
#Test
public void login_class() {
driver.get(url + "/Web/guest/login.aspx");
driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);
driver.findElement(By.id("txtUserName")).clear();
driver.findElement(By.id("txtUserName")).sendKeys("xxxxx#gmc.com");
driver.findElement(By.id("txtPassword")).clear();
driver.findElement(By.id("txtPassword")).sendKeys("xxxxx123");
driver.findElement(By.id("btnLogin")).click();
driver.get(url + "Web/guest/home/default.aspx");
driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);
driver.findElement(
By.cssSelector("span.menu-icons-sprite.menu-icon-signout"))
.click();
}
#BeforeTest
public void create_driver() {
driver.get(url);
driver.manage().window().maximize();
}
#AfterTest
public void exit() {
driver.quit();
}
}
And the exception given is followed
FAILED: login_class
org.openqa.selenium.WebDriverException: f.QueryInterface is not a function
Command duration or timeout: 5.10 seconds
Build info: version: '2.48.2', revision: '41bccdd', time: '2015-10-09 19:55:52'
System info: host: 'xxxxx-PC', ip: '10.0.0.192', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.7.0_45'
Session ID: 1e311cd0-34d1-4dd2-9cde-e52cbb9fb52e
Driver info: org.openqa.selenium.firefox.FirefoxDriver
Capabilities [{platform=WINDOWS, acceptSslCerts=true, javascriptEnabled=true, cssSelectorsEnabled=true, databaseEnabled=true, browserName=firefox, handlesAlerts=true, nativeEvents=false, webStorageEnabled=true, rotatable=false, locationContextEnabled=true, applicationCacheEnabled=true, takesScreenshot=true, version=42.0}]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:206)
at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:158)
at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:647)
at org.openqa.selenium.remote.RemoteWebDriver.get(RemoteWebDriver.java:311)
at bileetaTest.Login.login_class(Login.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:816)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1124)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:774)
at org.testng.TestRunner.run(TestRunner.java:624)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:359)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:354)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:312)
at org.testng.SuiteRunner.run(SuiteRunner.java:261)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1215)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1140)
at org.testng.TestNG.run(TestNG.java:1048)
at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:112)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:205)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:176)
Caused by: org.openqa.selenium.WebDriverException: f.QueryInterface is not a function
Build info: version: '2.48.2', revision: '41bccdd', time: '2015-10-09 19:55:52'
System info: host: 'xxxx-PC', ip: 'xxxxxxx', os.name: 'Windows 7', os.arch: 'amd64', os.version: '6.1', java.version: '1.7.0_45'
Driver info: driver.version: unknown
at .FirefoxDriver.prototype.get(file:///C:/Users/xxxxxx/AppData/Local/Temp/anonymous3548365288572112291webdriver-profile/extensions/fxdriver#googlecode.com/components/driver-component.js:10523)
===============================================
Default test
Tests run: 1, Failures: 1, Skips: 0

Answer 1

The issue was I have to add another "/" before the Path I had provided.