impossibilité d'ouvrir la dropbox

Bonjour

Je reçois ce message de mon ordi à l'ouvertue: 

bn.BUILD_KEY: Dropbox
bn.VERSION: 93.4.273
bn.constants.WINDOWS_SHELL_EXT_VERSION: 36
bn.is_frozen: True
machine_id: 4aae59f6-6af3-4086-91bc-fb584db3af9c
pid: 5984
cwd: 'C:\\Program Files (x86)\\Dropbox\\Client'
real_path='C:\\Program Files (x86)\\Dropbox\\Client'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
HOME: None
appdata: 'C:\\Users\\sabin\\AppData\\Local\\Dropbox\\instance1'
real_path='C:\\Users\\sabin\\AppData\\Local\\Dropbox\\instance1'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
dropbox_path: 'C:\\Users\\sabin\\Dropbox'
real_path='C:\\Users\\sabin\\Dropbox'
mode=0o40555 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
sys_executable: 'C:\\Program Files (x86)\\Dropbox\\Client\\Dropbox.exe'
real_path='C:\\Program Files (x86)\\Dropbox\\Client\\Dropbox.exe'
mode=0o100777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
trace.__file__: 'C:\\Program Files (x86)\\Dropbox\\Client\\93.4.273\\python-packages.zip\\dropbox\\client\\ui\\common\\boot_error.pyc'
real_path='C:\\Program Files (x86)\\Dropbox\\Client\\93.4.273\\python-packages.zip\\dropbox\\client\\ui\\common\\boot_error.pyc'
not found
parent not found
TMP: C:\Users\sabin\AppData\Local\Temp
TEMP: C:\Users\sabin\AppData\Local\Temp
tempdir: 'C:\\Users\\sabin\\AppData\\Local\\Temp'
real_path='C:\\Users\\sabin\\AppData\\Local\\Temp'
mode=0o40777 uid=0 gid=0
parent mode=0o40777 uid=0 gid=0
Traceback (most recent call last):
File "dropbox\client\main.pyc", line 2597, in startup_high
File "dropbox\client\main.pyc", line 5577, in _init_app_model
File "dropbox\foundation\navigation_service\factory.pyc", line 44, in create
File "dropbox\foundation\raii2\_shared_impl\base.pyc", line 407, in __call__
File "dropbox\foundation\raii2\_shared_impl\base.pyc", line 708, in wrapper
File "dropbox\foundation\navigation_service\navigation_service_impl.pyc", line 304, in __init__
File "dropbox\foundation\raii2\_shared_impl\base.pyc", line 407, in __call__
File "dropbox\foundation\raii2\_shared_impl\base.pyc", line 708, in wrapper
File "dropbox\foundation\html_views\local\common\manager.pyc", line 1169, in __init__
File "dropbox\foundation\raii2\_shared_impl\base.pyc", line 407, in __call__
File "dropbox\foundation\raii2\_shared_impl\base.pyc", line 708, in wrapper
File "dropbox\foundation\html_views\local\common\manager.pyc", line 360, in __init__
File "dropbox\foundation\html_views\local\common\scheme_handlers.pyc", line 86, in create
File "dropbox\foundation\raii2\_shared_impl\base.pyc", line 407, in __call__
File "dropbox\foundation\raii2\_shared_impl\base.pyc", line 708, in wrapper
File "dropbox\foundation\html_views\local\common\scheme_handlers.pyc", line 123, in __init__
File "zipfile.pyc", line 1225, in __init__
File "zipfile.pyc", line 1292, in _RealGetContents
zipfile.BadZipFile: File is not a zip file

Merci de votre aide.

Bien cordialement