There's a bug in the FTP action when dealing with wildcards: it only handles them properly when the first character in the Local file field (when putting) or the Remote file field (when getting) is a wildcard character. Otherwise, it treats the filename as a single file to be processed, resulting in an error. Here is an update with a fix for this:
http://www.kinook.com/Download/VisBuildNet.zip. Extract it to your VBP install path (close VBP first).