Unable to make a tag using svn copy

We're using subversion 1.2 on client and server over http.

We have a repository set out in the usual trunc, branches and tags way.
Starting today, when I try to make a tag by running the command:

    svn cp trunc/drupal tags/1.5.0

(we only put the drupal dir in our tags because the rest of the repo
contains stuff that doesn't get released to the main server)

After churning the drives for a while we get this:

    svn: Working copy
    'tags/1.5.0c-murders/modules/massmailer/engines/phplist/phplist' is
    missing or not locked

(without the word wrap of course!)

Now, I can't think of any reason why this folder would be any different from
any other in our repo. I've tried checking out a fresh working copy and
trying again, with the same results. svn status doestn't show any ouput
because nothing needs to be commited.

Does anyone recognise this situation, and have any suggestions how we can
fix it and make our tag?

Btw, our website is at http://surfcore.co.uk in case anyone's interested.

-- 
Jim
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