Scroll down appium robot framwork fails

I am trying to scroll down through settings section in an android the android opens the settings but fails and error message ValueError: Element locator '//android.widget.LinearLayout[@index="14"]' did not match any elements. and I am sure of the xpath as i tried it for click element and it worked without problems Here is the code
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`open application http://localhost:4723/wd/hub platformName=Android platformVersion=10 deviceName=emulator-5554 appPackage=com.android.settings appActivity=com.android.settings.Settings

scroll down //android.widget.LinearLayout[@index=“14”]
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