There is a problem when linking xml.vim plugin to html filetype.
Upgrade to latest version should solve it.
https://github.com/othree/xml.vim

Relevant commit:
https://github.com/othree/xml.vim/commit/b0b5a31b2f88cba11853b8d1d91a3679a7495a78

2011/8/5 <[email protected]>

> Status: New
> Owner: ----
> Labels: Type-Defect Priority-Medium
>
> New issue 18 by [email protected]: Markdown ftplugin causes error
> http://code.google.com/p/vim/**issues/detail?id=18<http://code.google.com/p/vim/issues/detail?id=18>
>
> Open any markdown file, vim will complain about error in ftplugin
> file, line 17
>
> This line contains following:
>
> let b:undo_ftplugin .= "|setl cms< com< fo<"
>
> It's assumed that the variable already exists whereas it's not true and
> other ftplugins just define this variable.
>
>
>
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