Thanks for the hint. The command "svn log -v" produces also the error. I will check for a newer version of the SVN server. I have an old debian server.
svn: E175009: The XML response contains invalid XML svn: E130003: Malformed XML: not well-formed (invalid token) at line 336 -- You received this message because you are subscribed to the Google Groups "TortoiseSVN" group. To unsubscribe from this group and stop receiving emails from it, send an email to tortoisesvn+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tortoisesvn/5e02c7b4-26ac-4e7c-aa5c-1c916412716bn%40googlegroups.com.