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That's an error from Inkscape and C++. The extension itself is Python code. If it was a problem with the extension code, you'd see a Python error and not a C++ error. Your issue is with Inkscape proper and you need to bring it up on an Inkscape forum. It may be that the extension is not properly installed (e.g., permissions) or some other problem. But this is not the extension itself. The extension doesn't even provide output which Inkscape reads back. Which is to say, it's not even possible for the extension to be providing incorrect output back to Inkscape.

Also, Ubuntu 13.04 is very new. It's not even clear if Inkscape 0.48 works correctly on Ubuntu 13.04. Another reason to brink this up in an Inkscape forum.