Lion Server webdav login blues

I have a mac mini running Lion Server. Previously I could WebDav sign in with Pages on a iPad. But... no it's broken. The accounts on the server work I can VPN in and get access to folders via AFP. But not through WebDav.

I get a "An error occurred. Please try again" message back

Any suggestions as to where to start troubleshooting?

Here is a snap shot of the log I'm getting

Jan 30 09:56:47 testdev org.apache.httpd.webdavsharing.monster.51468[4993]: Syntax error on line 18 of /etc/apache2/httpd_webdavsharing_sharepoints.conf:
Jan 30 09:56:47 testdev org.apache.httpd.webdavsharing.monster.51468[4993]: RewriteRule: bad flag delimiters
Jan 30 09:56:47 testdev com.apple.launchd[1] (org.apache.httpd.webdavsharing.monster.51468[4993]): Exited with code: 1