xml - Why is xmlns:android="http://schemas.android.com/apk/res/android" appearing grey and selector shown as an error suddenly? -

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http://schemas.android.com/apk/res/android" appearing grey , select error.">

why so? happening when tried add new xml file in drawable.the xmlns:android="http://schemas.android.com/apk/res/android" appearing grey , select error.

this error happening everywhere, xmlns uri not registered , etc. errors appearing, checked answers , suggestions didn't work

i using appcompat 7 21.0.2, android studio release candidate 1. happening , can't go away http://i.stack.imgur.com/rmxc7.png


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