Não foi possível iniciar o Dropbox

Aparece essa janela de erro:

No log aparece isso:

bn.BUILD_KEY: Dropbox
bn.VERSION: 29.4.20
bn.DROPBOXEXT_VERSION: failed
bn.is_frozen: True
machine_id: failed
pid: 1227
ppid: 1
uid: 502
user_info: pwd.struct_passwd(pw_name='guilherme.diniz', pw_passwd='********', pw_uid=502, pw_gid=20, pw_gecos='Guilherme Diniz', pw_dir='/Users/guilherme.diniz', pw_shell='/bin/bash')
effective_user_info: pwd.struct_passwd(pw_name='guilherme.diniz', pw_passwd='********', pw_uid=502, pw_gid=20, pw_gecos='Guilherme Diniz', pw_dir='/Users/guilherme.diniz', pw_shell='/bin/bash')
euid: 502
gid: 20
egid: 20
group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', 'helpdesk'])
effective_group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', 'helpdesk'])
DYLD_LIBRARY_PATH: None
cwd: u'/'
real_path='/'
mode=040755 uid=0 gid=0
parent mode=040755 uid=0 gid=0
HOME: u'/Users/guilherme.diniz'
appdata: u'/Users/guilherme.diniz/.dropbox/instance1'
real_path=u'/Users/guilherme.diniz/.dropbox/instance1'
mode=040700 uid=502 gid=20
parent mode=040700 uid=502 gid=20
dropbox_path: u'/Volumes/Guilherme/Dropbox'
real_path=u'/Volumes/Guilherme/Dropbox'
mode=040777 uid=502 gid=20
parent mode=040777 uid=502 gid=20
sys_executable: '/Applications/Dropbox.app/Contents/MacOS/Dropbox'
real_path='/Applications/Dropbox.app/Contents/MacOS/Dropbox'
mode=0100755 uid=502 gid=20
parent mode=040755 uid=502 gid=20
trace.__file__: '/Applications/Dropbox.app/Contents/Resources/python-resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
real_path='/Applications/Dropbox.app/Contents/Resources/python-resources/python-packages.zip/dropbox/client/ui/common/boot_error.pyc'
not found
parent not found
tempdir: u'/var/folders/n9/ll_69xks4ljd8tq26x2pyhgh0000gp/T'
real_path=u'/private/var/folders/n9/ll_69xks4ljd8tq26x2pyhgh0000gp/T'
mode=040700 uid=502 gid=20
parent mode=040755 uid=502 gid=20
Traceback (most recent call last):
File "dropbox/client/main.pyc", line 5597, in main_startup
File "dropbox/client/main.pyc", line 2352, in run
File "dropbox/client/configuration/manager.pyc", line 203, in load_config
File "dropbox/client/databases.pyc", line 287, in load_dropbox_config
File "dropbox/client/config.pyc", line 196, in __init__
File "dropbox/client/config.pyc", line 63, in create_tables
File "dropbox/sqlite3_helpers.pyc", line 188, in execute
OperationalError: disk I/O error