java.lang.NullPointerException: Cannot invoke "org.openqa.selenium.WebElement.click()" because "this.stagingLink" is null

Issues/Bugs
1

I am getting this error, can anybody solve it ?

error
error.png1920×1030 156 KB

Here is my Test
@Test
public void testOne() throws InterruptedException {

    System.out.println("Test 1");
    loginPage lp = new loginPage(driver);
    Thread.sleep(2000);
    lp.clickStagingLink();
}
2

in the picture instead of xpath i tried it with id as well. i know this xpath is wrong. here is my code.
package com.teo.pageObjects.android;

import io.appium.java_client.android.AndroidDriver;
import io.appium.java_client.pagefactory.AndroidBy;
import io.appium.java_client.pagefactory.AndroidFindBy;
import io.appium.java_client.pagefactory.AppiumFieldDecorator;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.FindBy;
import org.openqa.selenium.support.PageFactory;

public class loginPage {
private AndroidDriver driver;

public loginPage(AndroidDriver driver) {
    this.driver = driver;
    PageFactory.initElements(new AppiumFieldDecorator(driver), this.getClass());

}

@AndroidFindBy(id = “com.spectra_systems.jan:id/btnStaging”)
WebElement stagingLink;

public void clickStagingLink(){
    stagingLink.click();
}

}

3

You should follow a tutorial. Here is a good one:

https://www.swtestacademy.com/appium-tutorial/