frequent issues arising in android view, Error parsing XML: unbound prefix

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A couple of reasons that this can happen:

1) You see this error with an incorrect namespace, or a typo in the attribute. Like ‘xmlns’ is wrong, it should be xmlns:android

2) First node needs to contain:
xmlns:android="http://schemas.android.com/apk/res/android"

3) If you are integrating AdMob, check custom parameters like ads:adSize, you need

xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads"

4) If you are using LinearLayout you might have to define tools:

xmlns:tools="http://schemas.android.com/tools"

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