Getting facebook data since a specific post ~[({python})]~ -

i trying retrieve facebook posts user after post id. when it, unknown error.

my code:

from facebook import * token = facebook.get_app_access_token('3291xxxxxxxxxxxxx','c498e60cb1exxxxxxxxxxxxx') graph = graphapi(token) g = graph.get('travelguard/posts?limit=5&since=68827688457_10151569356908458')  >>> traceback (most recent call last):   file "<pyshell#40>", line 1, in <module>     graph.get('travelguard/posts?limit=5&since=68827688457_10151569356908458')   file "c:\documents , settings\visolank\desktop\python\programs\facepy\graph_api.py", line 42, in     retry=retry   file "c:\documents , settings\visolank\desktop\python\programs\facepy\graph_api.py", line 251, in _query     return self._query(method, path, data, page, retry - 1)   file "c:\documents , settings\visolank\desktop\python\programs\facepy\graph_api.py", line 251, in _query     return self._query(method, path, data, page, retry - 1)   file "c:\documents , settings\visolank\desktop\python\programs\facepy\graph_api.py", line 251, in _query     return self._query(method, path, data, page, retry - 1)   file "c:\documents , settings\visolank\desktop\python\programs\facepy\graph_api.py", line 248, in _query     return load(method, url, data)[0]   file "c:\documents , settings\visolank\desktop\python\programs\facepy\graph_api.py", line 210, in load     result = self._parse(response.content)   file "c:\documents , settings\visolank\desktop\python\programs\facepy\graph_api.py", line 290, in _parse     error.get('code', none) oautherror: [1] unknown error has occurred. 

facebook's api doesn't have best error messages. "an unknown error has occurred." means don't have permissions access you're trying access.