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Pin openpyxl to a version that still has savevirtualworkbook: pip install openpyxl==3.0.10. The reporter confirmed the error disappeared after downgrading, and a second user confirmed the same fix for XLS exports. Longer term, the Rossum CLI needs to stop importing the removed helper (a code upgrade for openpyxl 3.1+). Source: https://github.com/rossumai/rossum/issues/42