REBOL 3 Errors: invalid-spec

An attempt was made to create a port with make using a specification that a port could not be built from.

Message:

["Invalid port spec:" :arg1]

Example:

filter-error try [p: make port! [scheme: 'naughta]]
** Access Error: Invalid port spec: scheme naughta
** Where: p: make port! [scheme: 'naughta]