svn: E155004: ..(path of resource).. is already locked

Update and clean your working copy.

svn update
svn cleanup

If nothing else works, save your changes as a patch (TortoiseSVN → Create patch... or svn diff > changes.diff), and check out the repository anew. You can then apply the patch to the new working copy (TortoiseSVN → Apply patch... or svn patch changes.diff).