How to Fix SVN Error “The HTTP method ‘MKCOL’ is not allowed on …”

I ran into the following error while trying to svn commit the code of this plugin to WordPress plugin repository.

The HTTP method ‘MKCOL’ is not allowed on …

Got to discover via this stackoverflow thread that the error was as a result of me trying to add or push a directory that already existed in the SVN repository.

Wheew!