Impossible de démarrer Dropbox

Bonjour, 
Je n'arrive plus à utiliser dropbox sur mon ordinateur.
Le logiciel ne synchroniait plus rien hier.
J'ai donc désinstallé et re-téléchargé le logiciel. Quand j'essaie de l'installer, j'ai un message d'erreur qui s'affiche indiquant "Impossible de démarrer Dropbox". Je ne sais pas quoi faire… 

Voici le code que j'ai reçu et qu'on m'indique de transmettre à l'assistance dropbox. 

bn.BUILD_KEY: Dropbox
bn.VERSION: 212.4.5767
bn.constants.WINDOWS_SHELL_EXT_VERSION: 77
bn.is_frozen: True
machine_id: 27353ba4-5d66-5a11-88cb-2aab0c71a1b9
pid: 1502
ppid: 1
uid: 501
user_info: pwd.struct_passwd(pw_name='ceciliajim', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='Cecilia Jim', pw_dir='/Users/ceciliajim', pw_shell='/bin/bash')
effective_user_info: pwd.struct_passwd(pw_name='ceciliajim', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='Cecilia Jim', pw_dir='/Users/ceciliajim', pw_shell='/bin/bash')
euid: 501
gid: 20
egid: 20
group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', 'ceciliajim', '_serialnumberd'])
effective_group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', 'ceciliajim', '_serialnumberd'])
DYLD_LIBRARY_PATH: None
cwd: '/'
     real_path='/'
               mode=0o40755    uid=0    gid=0
     parent    mode=0o40755    uid=0    gid=0
HOME: '/Users/ceciliajim'
appdata: '/Users/ceciliajim/.dropbox/instance3'
         real_path='/Users/ceciliajim/.dropbox/instance3'
                   mode=0o40700    uid=501    gid=20
         parent    mode=0o40700    uid=501    gid=20
dropbox_path: '/Users/ceciliajim/Library/CloudStorage/Dropbox'
              real_path='/Users/ceciliajim/Library/CloudStorage/Dropbox'
                        not found
              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/1x/8cfrm07d32l6k_72skjyqw2r0000gn/T'
         real_path='/private/var/folders/1x/8cfrm07d32l6k_72skjyqw2r0000gn/T'
                   mode=0o40700    uid=501    gid=20
         parent    mode=0o40755    uid=501    gid=20
Traceback (most recent call last):
  File "desktop/dropbox/client/main.py", line 5910, in _setup_root_for_account
  File "desktop/dropbox/client/main.py", line 6139, in _get_root_for_account
  File "desktop/dropbox/sync_root/helpers.py", line 523, in get_root_for_account
  File "desktop/dropbox/foundation/futures/basic.py", line 874, in result
  File "../mac_x86_64_dropbox_virtual_env/lib/python3.8/threading.py", line 890, in _bootstrap
  File "../mac_x86_64_dropbox_virtual_env/lib/python3.8/threading.py", line 932, in _bootstrap_inner
  File "desktop/dropbox/db_thread.py", line 96, in run
  File "<string>", line 1, in _x__db_thread__sleep_thread
  File "desktop/dropbox/db_thread.py", line 36, in set_name_and_run
  File "../mac_x86_64_dropbox_virtual_env/lib/python3.8/threading.py", line 870, in run
  File "desktop/dropbox/foundation/runtime/__init__.py", line 676, in decorated
  File "desktop/dropbox/foundation/futures/sleep/__init__.py", line 163, in _run
  File "desktop/dropbox/foundation/futures/basic.py", line 704, in set_result
  File "desktop/dropbox/foundation/futures/basic.py", line 667, in _on_post
  File "desktop/dropbox/foundation/futures/basic.py", line 1050, in _stage1
  File "desktop/dropbox/foundation/futures/basic.py", line 421, in _then_callback
  File "desktop/dropbox/foundation/futures/helpers.py", line 436, in <lambda>
  File "desktop/dropbox/sync_root/handlers/macos/file_provider.py", line 1046, in _get_mount_path
dropbox.mac.internal.MacError: [Errno -2001] Error Domain=NSFileProviderErrorDomain Code=-2001 "Aucun fournisseur de fichier valide trouvé portant l’identifiant com.getdropbox.dropbox.fileprovider/f05695ea-f0b3-4dd9-a27d-5ca925129c09." UserInfo={NSLocalizedDescription=Aucun fournisseur de fichier valide trouvé portant l’identifiant com.getdropbox.dropbox.fileprovider/f05695ea-f0b3-4dd9-a27d-5ca925129c09.}