convert-ly error / Frescobaldi

[Thomas Scharkowski]

Convert-ly does not work if started from Frescobaldi, generating this 
message:

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


The document has not been changed.
--

Convert-ly works normally when started from Terminal.


macOS 10.15.1
LilyPond 2.19.83 (MacPorts)
Frescobaldi 2.20