Calibre 5.0.0 does not detect my Kindle Paperwhite

Hi,

I just upgraded to Calibre 5.0.0 and for the first time in 10 years Calibre fails to detect my Kindle (currently a Paperwhite, released in 2015).

I ran Calibre in debug-mode and the txt file says:

Unable to open device <calibre.devices.kindle.driver.KINDLE2 object at 0x11469a430>
Traceback (most recent call last):
File "site-packages/calibre/gui2/device.py", line 200, in do_connect
File "site-packages/calibre/devices/usbms/device.py", line 826, in open
File "site-packages/calibre/devices/usbms/device.py", line 422, in open_osx
TypeError: can't concat str to bytes

Connect to device failed, retrying in 5 seconds...

{'bsd_drives': {'main': '/dev/disk3s1'},
'drives': {'main': None},
'mount_map': {'/dev/disk1s1': b'/System/Volumes/Data',
'/dev/disk1s4': b'/private/var/vm',
'/dev/disk1s5': b'/',
'/dev/disk2s1': b'/Volumes/Transcend',
'devfs': b'/dev',
'map auto_home': b'/System/Volumes/Data/home'}}
Unable to open device <calibre.devices.kindle.driver.KINDLE2 object at 0x11469a430>
Traceback (most recent call last):
File "site-packages/calibre/devices/usbms/device.py", line 826, in open
File "site-packages/calibre/devices/usbms/device.py", line 411, in open_osx
calibre.devices.errors.DeviceError: Unable to detect the KINDLE2 mount point. Try rebooting.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "site-packages/calibre/gui2/device.py", line 200, in do_connect
File "site-packages/calibre/devices/usbms/device.py", line 829, in open
File "site-packages/calibre/devices/usbms/device.py", line 396, in open_osx
File "site-packages/calibre/devices/usbms/device.py", line 386, in osx_bsd_names
File "site-packages/calibre/devices/usbms/device.py", line 345, in _osx_bsd_names
calibre.devices.errors.DeviceError: Could not detect BSD names for Kindle 2/3/4/Touch/PaperWhite/Voyage Device Interface. Try rebooting.
Output from osx_get_usb_drives():
[('/dev/disk2s1',
1452,
33798,
2080,
'Apple',
'Internal Memory Card Reader',
'000000000820')]

Device connect failed again, giving up

I restarted Calibre, my Kindle but so far nothing has worked...