Running the Rossum CLI failed with "ImportError: cannot import name 'savevirtualworkbook' from 'openpyxl.writer.excel'". The savevirtualworkbook helper was removed in openpyxl 3.1, and the Rossum CLI code still imported it, so any install with openpyxl >= 3.1 crashed on the export path. The reporter confirmed the error disappeared after downgrading, and a second user confirmed the same workaround.