human
Solve the following python programming problem given the following code:
def _test_get_file_exists(self, tool_name, revision, base_commit_id, expected_revision, expected_found = True, expected_error = False) : 
    def _http_get(service, url, * args, **kwargs) : 
        self.assertEqual (url, ('https://mydomain.unfuddle.com/api/v1/repositories/2/history/?path=/path&commit=%s&count=0' % expected_revision)) 
        if expected_found : 
            return ('{}', { 
                
}) 
else : 
            raise HTTPError () 
account = self._get_hosting_account () 
    service = result.service 
    repository = Repository (hosting_account = account, tool = Tool.objects.get (name = tool_name)) 
    repository.extra_data = { 
        'unfuddle_account_domain' : 'mydomain', 
        'unfuddle_project_id' : 1, 
        'unfuddle_repo_id' : 2, 
        'unfuddle_repo_name' : 'myrepo', 
} 
    account.data ['password'] = encrypt_password ('password') 
    self.spy_on (service.client.http_get, call_fake = _http_get) 
    result = service.get_file_exists (repository, '/path', revision, base_commit_id) 
    if expected_error : 
        self.assertFalse (service.client.http_get.called) 
        self.assertFalse (result) 
else : 
        self.assertTrue (service.client.http_get.called) 
        self.assertEqual (result, expected_found) 

    
    

    Fix the buggy line: service = result.service
assistant
#Here is Python code to fix the buggy line: service = result.

service = account.service