I was able to signing previously, but after a system restore and reinstallation of the MacOS, this is the only application giving an error.
This is the error:
bn.BUILD_KEY: Dropbox
bn.VERSION: 228.4.5567
bn.constants.WINDOWS_SHELL_EXT_VERSION: 80
bn.is_frozen: True
machine_id: 24bad416-b43f-52a8-9ff3-909263253e76
pid: 1685
ppid: 1
uid: 501
user_info: pwd.struct_passwd(pw_name='brian', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='User Name', pw_dir='/Volumes/Crucial X10', pw_shell='/bin/zsh')
effective_user_info: pwd.struct_passwd(pw_name='brian', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='Brian Weaver', pw_dir='/Volumes/Crucial X10', 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'])
effective_group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root'])
DYLD_LIBRARY_PATH: None
cwd: '/'
real_path='/'
mode=0o40755 uid=0 gid=0
parent mode=0o40755 uid=0 gid=0
HOME: '/Volumes/Crucial X10'
appdata: '/Volumes/Crucial X10/.dropbox/instance6'
real_path='/Volumes/Crucial X10/.dropbox/instance6'
mode=0o40700 uid=501 gid=20
parent mode=0o40755 uid=501 gid=20
dropbox_path: None
not found
parent not found
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/5f/0wzs5ypj72v00w663v7tqrch0000gn/T'
real_path='/private/var/folders/5f/0wzs5ypj72v00w663v7tqrch0000gn/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 6861, in _setup_root_for_account
File "desktop/dropbox/sync_root/helpers.py", line 207, in create_root_for_account
File "desktop/dropbox/foundation/futures/basic.py", line 932, in result
File "desktop/dropbox/trace.py", line 351, in newfn
File "desktop/dropbox/sync_root/handlers/macos/file_provider.py", line 333, in _completion_domains
File "desktop/dropbox/sync_root/handlers/macos/file_provider.py", line 320, in set_result_or_convert_exception
File "desktop/dropbox/foundation/futures/basic.py", line 749, in set_result
File "desktop/dropbox/foundation/futures/basic.py", line 712, in _on_post
File "desktop/dropbox/foundation/futures/basic.py", line 1131, in _stage1
File "desktop/dropbox/foundation/futures/basic.py", line 991, in _when_done
File "desktop/dropbox/foundation/futures/basic.py", line 1150, in _stage2
File "desktop/dropbox/foundation/futures/basic.py", line 749, in set_result
File "desktop/dropbox/foundation/futures/basic.py", line 712, in _on_post
File "desktop/dropbox/foundation/futures/basic.py", line 1112, in _stage1
File "desktop/dropbox/foundation/futures/basic.py", line 455, in _then_callback
File "desktop/dropbox/sync_root/handlers/macos/file_provider.py", line 1043, in _init_completion
File "desktop/dropbox/trace.py", line 351, in newfn
File "desktop/dropbox/sync_root/handlers/macos/file_provider.py", line 969, in _init_completion_inner
dropbox.mac.internal.MacError: [Errno 19] Error Domain=NSPOSIXErrorDomain Code=19 "Operation not supported by device"