CVS to Subversion - complete I think

I believe the CVS-to-Subversion migration is complete.  I've not yet been
able to do a checkout that allows me to commit.  I think I'm just missing
some flags on my svn co command.  My laptop login is "skip" while my SF
login is "montanaro".  

I checked it out using

    svn co --username=montanaro https://montanaro-4h9KtQdq+ArmbK/Hy6phlZG/[email protected]/svnroot/spambayes/trunk spambayes

When I try to check in a change using 

    svn commit --username=montanaro -m 'first commit - note version control change'

I get this output:

    Authentication realm: <https://spambayes.svn.sourceforge.net:443> SourceForge Subversion area
    Password for 'montanaro': 
    Authentication realm: <https://spambayes.svn.sourceforge.net:443> SourceForge Subversion area
    Username: svn: Commit failed (details follow):
    svn: MKACTIVITY of '/svnroot/spambayes/!svn/act/7c13b838-9cac-4e6d-9c05-0528431381a2': authorization failed (https://spambayes.svn.sourceforge.net)

Any thoughts on what I'm missing?

Thx,

Skip