convert-ly error

[Thomas Scharkowski]

% convert-ly
ImportError: Bad magic number in 
/Applications/Frescobaldi.app/Contents/Resources/site.pyc

LilyPond 2.20.0
LilyPond 2.19.84

macOS 10.15.4


When I use the command from Frecobaldi (3.1.1) I get the following:

arch: posix_spawnp: 
/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7: 
Bad CPU type in executable

Thank you,
Thomas