Why the ladybug failed to 'fly' on Mac

Hello,there is a problem with my friend’s mac when he firstly used ladybug, and I wondered why。
Besides,what he did reported error(mac) didnot turn out any problem on my windows
Can someone be so kind to explain it for me?
thx

Oh,by the way,please forgive my poor English speaking

Hi - the Ladybug’s defaultFolder_ input is expecting a path (or nothing to accept the default) - not a boolean.


-wim