Couldn't Start Dropbox error

Hi, can anyone help me, Dropbox app wont open on my mac under my user anymore, i keep getting a permissions error, but it opens fine if i login as a guest user, have tried deleting all dropbox files etc, have reinstalled etc, firewall is off etc, have tried all the tricks suggested here, can anyone help?

bn.BUILD_KEY: Dropbox
bn.VERSION: 141.4.3299
bn.constants.WINDOWS_SHELL_EXT_VERSION: 52
bn.is_frozen: True
machine_id: c6d0416e-a5ea-5a69-8a92-3f93e2b97948
pid: 824
ppid: 1
uid: 501
user_info: pwd.struct_passwd(pw_name='stephscarmozzino', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='steph Scarmozzino', pw_dir='/Users/stephscarmozzino', pw_shell='/bin/zsh')
effective_user_info: pwd.struct_passwd(pw_name='stephscarmozzino', pw_passwd='********', pw_uid=501, pw_gid=20, pw_gecos='steph Scarmozzino', pw_dir='/Users/stephscarmozzino', 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', '_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/stephscarmozzino'
appdata: '/Users/stephscarmozzino/.dropbox/instance1'
real_path='/Users/stephscarmozzino/.dropbox/instance1'
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/zj/k2h_vfcn471bc8cw8rtdht7m0000gn/T'
real_path='/private/var/folders/zj/k2h_vfcn471bc8cw8rtdht7m0000gn/T'
mode=0o40700 uid=501 gid=20
parent mode=0o40755 uid=501 gid=20
Traceback (most recent call last):
File "dropbox/client/authentication/register_host_helper.pyc", line 483, in _try_register_host
File "dropbox/client/authentication/register_host_helper.pyc", line 949, in handle_changed_host_secret
File "dropbox/sync_root/helpers.pyc", line 367, in destroy_root_from_config
AssertionError