fgb.BulgeGraph missing 2 required positional arguments: 'graph_construction' and 'seq_obj'

[BioITWorker]

Thanks for outstanding jobs in forna nice show .I can start forna ,but i encounter a question when submit molecule。how can i initialize 'graph_construction' and 'seq_obj' ? thank again.
fgb.BulgeGraph()
TypeError: init() missing 2 required positional arguments: 'graph_construction' and 'seq_obj'