SVN 405 Method Not Allowed

The quickest way for me to fix it was to duplicate the affected folder, and commit it with an alternative name. Then svn mv duplicateFolder originalFolder. Pretty easy.

So, take folder1 and make a folder1Copy:

svn delete folder1
svn add folder1Copy

Commit and update:

svn mv folder1Copy/ folder1/

Commit again and it's fixed.

My "disappeared" folder was libraries/fof.

If I deleted it, then ran an update, it wouldn't show up.

cd libaries
svn up

(nothing happens).

But updating with the actual name:

svn update fof

did the trick and it was updated. So I exploded my (manually tar-archived) working copy over it and recommitted. Easiest solution.

My guess is that the folder you are trying to add already exists in SVN. You can confirm by checking out the files to a different folder and see if trunk already has the required folder.