Error: The processing instruction target matching "[xX][mM][lL]" is not allowed

Xerces-based tools will emit the following error

The processing instruction target matching "[xX][mM][lL]" is not allowed.

when an XML declaration is encountered anywhere other than at the top of an XML file.

This is a valid diagnostic message; other XML parsers should issue a similar error message in this situation.

To correct the problem, check the following possibilities:

1. Some blank space or other visible content exists before the <?xml ?>declaration.

   Resolution: remove blank space or any othervisible content before the XML declaration.

2. Some invisible content exists before the <?xml ?>declaration. Most commonly this is a Byte Order Mark(BOM).

   Resolution:Remove the BOM using techniques such as those suggested by the W3Cpage on the BOM in HTML.

3. A stray <?xml ?> declaration exists within the XML content. This can happen when XML files are combined programmatically orvia cut-and-paste. There can only be one <?xml ?> declarationin an XML file, and it can only be at the top.

   Resolution: Search for<?xml in a case-insensitive manner, and remove all but the top XMLdeclaration from the file.

Reason for me is 2 of following code in one xml

<?xml version="1.0" encoding="utf-8"?>

There was auto generated Copyright message in XML and a blank line before <resources> tag, once I removed it my build was successful.