I followed up with Chris on this to see how he resolved it …
… check root folder of the package and make sure that you only have manifest.v3. I had edited mine in an editor and had a manifest.v3.bak and that seemed to cause the problem
So created another release excluding the .bak file and was able to import it successfully.
#Integration-Server-and-ESB#Flow-and-Java-services#webMethods