Dropbox konnte nicht gestartet werden. - Mac

Auf einmal konnte meine Dropbox auf meinem Mac Laptop nicht mehr gestartet werden - mitten während ich in der üblichen Bearbeitung war. Ich habe also nichts anders gemacht, als die letzten Jahre. Ich habe sie bereits mehrmals deinstalliert und neu installiert, leider keine Veränderung. Auf allen anderen Geräten funktioniert sie weiterhin problemlos.

Angezeigter Text der Störung:

"Normalerweise weist dies auf einen Berechtigungsfehler hin. Außerdem kann das Speichern des Basisordners auf einer Netzwerkfreigabe einen Fehler verursachen."

Der Text der angezeigten txt Datei der Fehlermeldung:
bn.BUILD_KEY: Dropbox
bn.VERSION: 141.4.3299
bn.constants.WINDOWS_SHELL_EXT_VERSION: 52
bn.is_frozen: True
machine_id: 1cdadbcc-99b1-576f-bd4e-1315e7cdc6ba
pid: 9419
ppid: 1
uid: 501
user_info: pwd.struct_passwd(pw_name='miridings', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='Miri Dings', pw_dir='/Users/miridings', pw_shell='/bin/zsh')
effective_user_info: pwd.struct_passwd(pw_name='miridings', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='Miri Dings', pw_dir='/Users/miridings', pw_shell='/bin/zsh')
euid: 501
gid: 20
egid: 20
group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', 'miridings', '_nsurlstoraged'])
effective_group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', 'miridings', '_nsurlstoraged'])
DYLD_LIBRARY_PATH: None
cwd: '/'
real_path='/'
mode=0o40755 uid=0 gid=0
parent mode=0o40755 uid=0 gid=0
HOME: '/Users/miridings'
appdata: '/Users/miridings/.dropbox/instance1'
real_path='/Users/miridings/.dropbox/instance1'
mode=0o40700 uid=501 gid=20
parent mode=0o40755 uid=501 gid=20
dropbox_path: '/Users/miridings/Dropbox'
real_path='/Users/miridings/Dropbox'
mode=0o40700 uid=501 gid=20
parent mode=0o40755 uid=501 gid=20
sys_executable: '/Applications/Dropbox.app/Contents/MacOS/Dropbox'
real_path='/Applications/Dropbox.app/Contents/MacOS/Dropbox'
mode=0o100755 uid=501 gid=20
parent mode=0o40755 uid=501 gid=20
trace.__file__: '/Applications/Dropbox.app/Contents/Resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
real_path='/Applications/Dropbox.app/Contents/Resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
not found
parent not found
tempdir: '/var/folders/g7/dm33mlfj5vdgzbrjbcl8z78h0000gn/T'
real_path='/private/var/folders/g7/dm33mlfj5vdgzbrjbcl8z78h0000gn/T'
mode=0o40700 uid=501 gid=20
parent mode=0o40755 uid=501 gid=20
Traceback (most recent call last):
File "dropbox/client/main.pyc", line 838, in wrapper
File "dropbox/client/main.pyc", line 6619, in finish_dropbox_boot
File "dropbox/client/message_queue.pyc", line 313, in _wrapped
File "dropbox/client/main.pyc", line 6167, in _init_components_for_account
File "dropbox/client/main.pyc", line 6091, in create_sync_engine
File "dropbox/sync_engine_boundary/factory.pyc", line 218, in make_sync_engine
File "dropbox/sync_engine/nucleus/classic_client/sync_engine.pyc", line 268, in __init__
File "dropbox/sync_engine/nucleus/classic_client/modern_client/modern_client.pyc", line 250, in __init__
File "dropbox/sync_engine/nucleus/classic_client/modern_client/base.pyc", line 202, in __init__
File "dropbox/sync_engine/nucleus/classic_client/thin_adapter/in_proc.pyc", line 217, in __init__
File "dropbox/sync_engine/nucleus/classic_client/thin_adapter/in_proc.pyc", line 529, in _init_new_engine_locked
File "dropbox/sync_engine/nucleus/thin_client/client.pyc", line 133, in __init__
File "desktop/extensions/nucleus/nucleus_python.pyx", line 76, in nucleus_python.NucleusSyncEngine.__cinit__
nucleus_python.SyncEngineError: "Initializing engine |>> Initializing filesystem |>> Attempting to register icons |>> Reading existing xattr |>> fgetxattr syscall: determined size |>> Permission denied"

Was ist das Problem und wie kann es behoben werden?!