I m trying to implement Extent Reports but getting Null Pointer Exception. If i am running this code, without using Extent Report functionality it’s working fine. Kindly help. l

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java.lang.NullPointerException: Cannot invoke "com.aventstack.extentreports.ExtentTest.log(com.aventstack.extentreports.Status, String)" because "com.weirdo.listeners.ExtentListeners.test" is null
    at com.weirdo.base.Page.<init>(Page.java:121)
    at com.weirdo.utilities.ExcelReader.<init>(ExcelReader.java:39)
    at com.weirdo.base.Page.<clinit>(Page.java:48)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) 

**Below are my implementation**

**ExtentReport implementation part:**
public class ExtentManager {

    private static ExtentReports extent;
    
    public static String fileName;
    

        public  static ExtentReports createInstance() {
            if(extent==null)
            {
            Date d = new Date();
            String reportName = "Extent_"+d.toString().replace(":", "_").replace(" ", "_") +".html";
            ExtentSparkReporter htmlReporter = new ExtentSparkReporter(".\reports\" + reportName);
          
            
            htmlReporter.config().setTheme(Theme.STANDARD);
            htmlReporter.config().setDocumentTitle("POM Framework");
            htmlReporter.config().setEncoding("utf-8");
            htmlReporter.config().setReportName("POM Framework");
            extent = new ExtentReports();
            extent.attachReporter(htmlReporter);
            extent.setSystemInfo("Automation Tester", "*****");
            extent.setSystemInfo("Organization", "xyxy");
          
            }
            return extent;
            }