By the way, there is an online validator for SBML files available: http://sbml.org/Facilities/Validator
This helps to check whether an SBML file is correct or not. It seems
this one is not correct. We will now check why you get these strange
error messages from JSBML.
Dipl.-Bioinform. Andreas Dräger
University of Tuebingen
Center for Bioinformatics Tuebingen (ZBIT)