You need to set another locale, because a filename in the SVN uses it. For me, the following export solved the problem:
export LC_ALL=es_ES.UTF-8
To see all locales you can choose from:
locale -a
af_ZA
af_ZA.ISO8859-1
af_ZA.ISO8859-15
af_ZA.UTF-8
am_ET
am_ET.UTF-8
...
Further info here:
http://svnbook.red-bean.c....l10n.html