Canot invok "org.openqa.selenium.WebDriver.findElement(org.openqa.selenium.By)" because "this.driver" is null at pageObject.LandingPage.searchItem - selenium-webdriver

Question

below landingpage.java code and LandingPageStepDefination.java
where to make changes so that NullPointerException issue will resolve
.................Landingpage.java.............
public class **LandingPage** {
public WebDriver driver;
By search=By.xpath("//input[#placeholder='Search for Vegetables and Fruits']");
By ProductName=By.cssSelector("h4.product-name");
By topDeals=By.xpath("//a[normalize-space()='Top Deals']");
public LandingPage(WebDriver driver)
{
this.driver=driver;
}
public void searchItem(String name)
{
driver.findElement(search).sendKeys(name);
}
public String getProductName()
{
return driver.findElement(ProductName).getText();
}
public void SelectTopDealsPage()
{
driver.findElement(topDeals).click();
}
}
...................landingpagestepDefination.java
public class LandingPageStepDefination {
public WebDriver driver;
public String landingproductName;
public String offerpageproductname;
pageObjectManager pageObjectManager;
// setups setups1;
setups setups;
LandingPage LandingPageLandingPage;
public LandingPageStepDefination(setups setups) {
this.setups = setups;
}
#Given("user in greencart landing page")
public void user_in_greencart_landing_page() {
}
#When("user search with shortname {string} and extrach actual name of product")
public void user_search_with_shortname_and_extrach_actual_name_of_product(String Shrotname)
throws InterruptedException {
LandingPage LandingPage = setups.pageObjectManager.getMeLandingPage();
LandingPage.searchItem(Shrotname);
Thread.sleep(5000);
setups.landingproductName = LandingPage.getProductName().split("-")[0].trim();
System.out.println(landingproductName);
}
}