XML / Module problem? (Just upgraded both Eclipse and the GWT plugin..errors appeared on projects reimporting)

I've started to get lots of XML errors flagging when I try to compile.
It seems it cant find the source code for various bits of XML
handeling;

[ERROR] Line 1486: No source code is available for type
com.google.gwt.xml.client.Document; did you forget to inherit a
required module?
[ERROR] Line 1486: No source code is available for type
com.google.gwt.xml.client.XMLParser; did you forget to inherit a
required module?
[ERROR] Line 1490: No source code is available for type
com.google.gwt.xml.client.NodeList; did you forget to inherit a
required module?
...
etc.

Yet, I *do* have;

<inherits name="com.google.gwt.xml.XML"/>

In my module files.
What gives?
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