Save all macports packages of Big Sur and install them or upgrade them into new macport packages manager of Monterey OS

I have just upgraded my macBook pro 16" from Big Sur to Monterey. The issue is that I have tried to save all the macports that I had previously on Big Sur but I get an error : $ sudo port -qv installed > myports.txt Error: Current platform "darwin 21" does not match expected platform "darwin 20" Error: If you upgraded your OS, please follow the migration instructions: https://trac.macports.org/wiki/Migration Error: /opt/local/bin/port: Failed to initialize MacPorts, OS platform mismatch port selfupdate Error: Current platform "darwin 21" does not match expected platform "darwin 20" Error: If you upgraded your OS, please follow the migration instructions: https://trac.macports.org/wiki/Migration OS platform mismatch while executing "mportinit ui_options global_options global_variations" Error: /opt/local/bin/port: Failed to initialize MacPorts, OS platform mismatch I would like to install the new version of macport for Monterey but I don't know how to save all the /opt/local/* packages of previous macOS Big Sur macports. Could anyone see a fix to keep all my macports packages with Monterey OS ?