"URI is not registered" error Android Studio

Question

My app compiles successfully, but I get this error:

URI is not registered (Settings | Languages & Fragmeworks | Schemas and DTDs)

at

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:ns1="urn:oasis:names:tc:xliff:document:1.2">

in my arabic strings.xml

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I've seen these links:

1. Why is Android Studio reporting "URI is not registered"?
2. Android Studio: Error parsing XML & URI is not registered
3. Why am I getting error message "URI is not Registered"?

But none of them helped me.

Answer 1

It turns out I was editing the DEBUG version of the strings.xml, to fix it, simply close the tab that has the error and re-open it.