.java.lang.NullPointerException ...用于CaptureScreenshots。甚至提供正确的路径

Question

这是我为takeScreenshot获得的例外...正确路径

我甚至不知道路由导致甚至知道nullpointerexception 对于截图，我提供了正确的截图 请帮我这个

java.lang.NullPointerException
at com.testing.core.ddf.base.BaseTest.takeScreenshot(BaseTest.java:167)
at com.testing.core.ddf.testcases.DummyTestB.TestB(DummyTestB.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
-----------------------------------------------
public void takeScreenshot()
{
    Date  d =new Date();
    //String screenshotFile  = d.toString().replace(":", "_").replace(" ", "_")+".png";
    String screenshotFile  = d.toString().replace(":", "_").replace(" ", "_")+".png";
    File scrFile  =((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
    try 
    {
        FileUtils.copyFile(scrFile, new File(System.getProperty("user.dir")+"\\Screenshots\\"+screenshotFile));
    }
    catch(Exception ex)
    {
        ex.printStackTrace();

    }

    //test.log(LogStatus.INFO,"Screenshot-> "+ test.addScreenCapture("E:\\selenium_practice\\Maven_Workspace\\Data_Driven_core_Framework\\Screenshots"+screenshotFile));

第167行。

test.log(LogStatus.INFO,"Screenshots -> "+test.addScreenCapture(System.getProperty("user.dir")+"//Screenshots//"+screenshotFile));
}

DummyTestB .java

public class DummyTestB extends BaseTest {
ExtentReports rep  =ExtentManager.getInstance();
ExtentTest test ;

@Test
public void TestB() throws IOException
{

    test = rep.startTest("DummmyTestB");
    test.log(LogStatus.INFO, "Starting the DummyTest");

    OpenBrowser("Mozilla");
    test.log(LogStatus.INFO, "Opened the Browser");
    //driver.System.out.println("This is Test B1");
    Navigate("FBURL");
    test.log(LogStatus.INFO, "Navigated to URL");
    type("FBUser_id","FB_username");
    test.log(LogStatus.INFO, "Entered username");
    type("FBPass_id","FB_password");
    test.log(LogStatus.INFO, "Entered Password");
    Click("Login_Button_Xpath");
    test.log(LogStatus.INFO, "clicked to Login");
    test.log(LogStatus.PASS, "Test Case B Pass");
    //
Line no 39  takeScreenshot();
}