Struggling with SVN

Sorry if this is basics but I'm struggling with SVN.
As you may know, I've been working on a branch called newcontrolrulers.
I now realise that good practice would have been to keep this branch up
to date with trunk so I'm trying to merge changes from trunk into
newcontrolrulers in advance of merging newcontrolrulers back into trunk.

>From a freshly checked-out newcontrolrulers directory, I'm running:
svn merge
https://rosegarden.svn.sourceforge.net/svnroot/rosegarden/trunk/rosegarden

I had tried the same URL without the rosegarden on the end but the same
effect.
I just get silence, nada, nothing. Please tell me I'm doing something
stupid?
Chris


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