Error on saving imported sbml file

[hasanbalci]

When we export an sbml file and try to save it as a nwt file, it gives error which can be seen in the developer console.

Edit: When I try to import below sbml file, it also gives an error. (This is the sample sbml file used in syblars.)

SBML_Sample.sbml.txt

[ugurdogrusoz]

Now when I import the attached above sample and save it (as .nwt) and load it back, I do not get the complex members back: