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I write automation for Android TV streaming app, I have problem to run the test. When I'm trying to run test , i got error:

org.openqa.selenium.WebDriverException: An unknown server-side error occurred while processing the command. Original error: io.appium.uiautomator2.common.exceptions.UiAutomator2Exception: java.lang.IllegalArgumentException: Namespace with prefix 'com.onoapps.some.dev' has not been declared.

Anyone know what the problem is?

I'm using:

That's what I was trying to do.

        public class RemoteControl extends AppiumBaseClass {
            public RemoteControl(AppiumDriver driver) {
                PageFactory.initElements(new AppiumFieldDecorator(driver), this);
            @AndroidFindBy(xpath = "//com.onoapps.some.dev:id/topRootId[@focusable='true']")
            private MobileElement currentTab;
            public String getCurrentTabName() {
                MobileElement tabText = currentTab.findElement(By.id("com.onoapps.some.dev:id/topBarItemTextViewId"));
                return tabText.getText();
        public class SeriesScreenFlows extends BaseTestClass {
            public void getSeriesTab(){
        getCurrentTabName();
        public class BaseTestClass extends AppiumBaseClass {
            public WebDriverWait wait;
            public Series_screen series_screen;
            public RemoteControl remoteControl;
            @Before
            public void setUp() throws MalformedURLException {
                AppiumController.instance.start();
                series_screen = new Series_screen(driver());
                remoteControl = new RemoteControl(driver());
You don't need to include you app package when you locate a MobileElement by ID so change this line: 
MobileElement tabText = currentTab.findElement(By.id("com.onoapps.some.dev:id/topBarItemTextViewId"));
to this
MobileElement tabText = currentTab.findElement(By.id("topBarItemTextViewId"));
and your test should start working as expected. 
Alternatively if you want to use XPath 
MobileElement tabText = currentTab.findElement(By.xpath("//*[@id='com.onoapps.some.dev:id/topBarItemTextViewId']"));
More information: AS - Run your existing Appium tests
        
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