Im using the extension Semantic Internal Objects, version 0.6.8, and my SMW version is 1.19

When importing to RDF a page which has an internal object, it takes me to a screen that says:

This page contains the following errors:

error on line 2 at column 1: Extra content at the end of the document

Below is a rendering of the page up to the first error.

Is this a known bug? what can I do to fix this problem?

Thanks a lot,