PageFactory is throwing exception when complete suite is being run . Running individual class works fine

Issues/Bugs
1

I have a Appium Testng Framework which has been developed in intellij, Whenever i run the class locally from intellij everything works fine but when I create a run configuration giving path of xml file , it throws exception
java.lang.IllegalArgumentException: Can not set io.appium.java_client.MobileElement field PageObjects.Create_customerObjRep.identification to org.openqa.selenium.remote.RemoteWebElement$$EnhancerByCGLIB$$d27c0df4

This is my objectory class

public class LoginObjRep {

@AndroidFindBy(id = “txtHaId”)
@CacheLookup
public MobileElement user_id;

Then a class for pages

public class LoginPage extends BasePage {

LoginObjRep loginObjRep =new LoginObjRep();

public LoginPage(AppiumDriver driver) {
super(driver);
PageFactory.initElements(new AppiumFieldDecorator(driver,5, TimeUnit.SECONDS),loginObjRep)

}

And finally test class

if(loginPage == null)
loginPage=new LoginPage(driver);

loginPage.ValidLogin();

}

**My xml is **
<?xml version="1.0" encoding="UTF-8"?>

<test name="SetUp">
    <classes>
        <class name="Tests.AppiumBaseTest"/>
    </classes>
</test>

<test name="LoginTest">
    <classes>
        <class name="Tests.LoginTest"/>
    </classes>
</test>


<test name="CreateCustomer">
    <classes>
        <class name="Tests.CreateCustomerTest"/>
    </classes>
</test>


<test name="Dashboard Elements">
    <classes>
        <class name="Tests.DashboardTest">
        </class>
    </classes>
</test>

<!-

When I run the xml file it only runs once class . I.e, DashboardTest for rest of the class it throws the exception