That is the error from the old version of the extension. Somehow it isn't getting updated. You won't get this error when the latest version is properly installed.
Does the extension manager show version 1.0.4 installed?
I'd try completely removing all of the extensions you have installed, then uninstall and re-install the extension manager. Then try installing the extensions again making sure to download and install the latest version from our site.
The issue is that your Dreamweaver is still running the old version of the files.