Selective Sync not working, can't sync folders to the app

This issue has now gotten even worse as now Dropbox won't even open, I keep getting an error message saying "Couldn't open dropbox. This may be a temporary error. Please restart dropbox." I've restarted, uninstalled and reinstalled, rebooted the computer and downloaded the latest OS Sanoma etc. But nothing works.. Below is the message I'm getting. I'm using a Macbook air. 

bn.BUILD_KEY: Dropbox
bn.VERSION: 186.4.6207
bn.constants.WINDOWS_SHELL_EXT_VERSION: 67
bn.is_frozen: True
machine_id: 222eef63-ae08-58a9-b7e9-7b509dd3da3f
pid: 38677
ppid: 1
uid: 502
user_info: pwd.struct_passwd(pw_name='***', pw_passwd='********', pw_uid=502, pw_gid=20, pw_gecos='***', pw_dir='/Users/***', pw_shell='/bin/zsh')
effective_user_info: pwd.struct_passwd(pw_name='***', pw_passwd='********', pw_uid=502, pw_gid=20, pw_gecos='***', pw_dir='/Users/***', pw_shell='/bin/zsh')
euid: 502
gid: 20
egid: 20
group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', '***', '_nsurlstoraged'])
effective_group_info: grp.struct_group(gr_name='staff', gr_passwd='*', gr_gid=20, gr_mem=['root', '***', '_nsurlstoraged'])
DYLD_LIBRARY_PATH: None
cwd: '/'
real_path='/'
mode=0o40755 uid=0 gid=0
parent mode=0o40755 uid=0 gid=0
HOME: '/Users/amandanelsonbulleyn'
appdata: '/Users/***/.dropbox/instance1'
real_path='/Users/***/.dropbox/instance1'
mode=0o40700 uid=502 gid=20
parent mode=0o40755 uid=502 gid=20
dropbox_path: '/Users/***/Att Pynta Dropbox'
real_path='/Users/***/Att Pynta Dropbox'
not found
parent mode=0o40755 uid=502 gid=20
sys_executable: '/Applications/Dropbox.app/Contents/MacOS/Dropbox'
real_path='/Applications/Dropbox.app/Contents/MacOS/Dropbox'
mode=0o100755 uid=502 gid=20
parent mode=0o40755 uid=502 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/1j/zx4ftbf5061cwyhx02jxsvc00000gp/T'
real_path='/private/var/folders/1j/zx4ftbf5061cwyhx02jxsvc00000gp/T'
mode=0o40700 uid=502 gid=20
parent mode=0o40755 uid=502 gid=20
Traceback (most recent call last):
File "desktop/dropbox/client/authentication/register_host_helper.py", line 500, in _try_register_host
File "desktop/dropbox/client/authentication/register_host_helper.py", line 676, in _on_register_host_success
File "desktop/dropbox/infinite/preferences.py", line 151, in update_local_config_from_server
File "desktop/dropbox/infinite/preferences.py", line 246, in _get_root_policy_unlocked
File "desktop/dropbox/infinite/preferences.py", line 263, in _get_user_choice_root_policy_unlocked
File "desktop/dropbox/infinite/preferences.py", line 282, in _get_policy_for_source_unlocked
File "desktop/dropbox/infinite/preferences.py", line 78, in from_str
ValueError: 17004267649