Cannot find the declaration of element

I upgraded to Android Studio V3. On one of my projects (not all) I am getting this;

<resources xmlns:ns1="urn:oasis:names:tc:xliff:document:1.2">

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This is in values.xml (a system therefore uneditable file) and is giving me
Cannot find the declaration of element 'resources'
This is an error that is preventing my project from building. Any ideas on what I can do to remove xliff?
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Chris Harte2015 Top Expert (Most Article Points)Asked:
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Chris Harte2015 Top Expert (Most Article Points)Author Commented:
Turns out the problem was not with the resources tag but with a nested item tag. The item tag was set by a colour item in the styles.xml. I removed the item tags from the styles xml and the project built. This was after messing around with the theme editor for a couple of hours.

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Chris Harte2015 Top Expert (Most Article Points)Author Commented:
Figured it out myself
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