Loading of JOSM cryptic preset debug/error message

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During loading of JOSM, I get this error message, obviously something not right in a home-made preset, but I can't identify what is wrong, so I don't know what to search for, the file is more than 6000 lines, so without a more understandable error message it is like searching for a needle in a haystack

(would be an improvement if debugging messages for presets and map paints gave a line number for the error)

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JOSM error message

[Don-vip]

There's a "&B" somewhere in the XML file. You probably want to write "&B". See ​http://en.m.wikipedia.org/wiki/List_of_XML_and_HTML_character_entity_references for details.

[Aun Johnsen <lists@…>]

If the error message had given me a line number I would have found it by myself, "&B" didn't say me much by itself, but had I gotten the line number than I would have realised the error very easily. I had other (though more searchable) errors as well, such as keyword without =

I don't think adding line number to error messages would be too difficult to code - should be put on a todo list (some errors handle it already)

[Don-vip]

It is more difficult than you think as parsing errors are raised by Java's parser and we have no control on error messages contents. Entities are an important notion in HTML/XML. Everyone writing XML should know about them.