diff --git a/external_file_location/abstract_task.py b/external_file_location/abstract_task.py
index b1016fac..f8fe3237 100644
--- a/external_file_location/abstract_task.py
+++ b/external_file_location/abstract_task.py
@@ -6,6 +6,11 @@ from base64 import b64encode
 
 class AbstractTask(object):
 
+    _name = None
+    _key = None
+    _synchronize_type = None
+    _default_port = None
+
     def create_file(self, filename, data):
         ir_attachment_id = self.env['ir.attachment.metadata'].create({
             'name': filename,
diff --git a/external_file_location/task.py b/external_file_location/task.py
index 69a1294f..bdf3e66a 100644
--- a/external_file_location/task.py
+++ b/external_file_location/task.py
@@ -50,11 +50,10 @@ class Task(models.Model):
         return [('move', 'Move'), ('delete', 'Delete')]
 
     def _get_method(self):
-        print 'get method'
         res = []
         for cls in itersubclasses(AbstractTask):
-            if cls._synchronize_type: #\
-               # and cls._key == self._context.get('protocol'):
+            if cls._synchronize_type:  # \
+              # and cls._key == self._context.get('protocol'):
                 cls_info = (cls._key + '_' + cls._synchronize_type,
                             cls._name + ' ' + cls._synchronize_type)
                 res.append(cls_info)
diff --git a/external_file_location/tasks/abstract_fs.py b/external_file_location/tasks/abstract_fs.py
index d3e1a1d2..44cfd396 100644
--- a/external_file_location/tasks/abstract_fs.py
+++ b/external_file_location/tasks/abstract_fs.py
@@ -20,7 +20,6 @@
 ##############################################################################
 
 from ..abstract_task import AbstractTask
-from base64 import b64decode
 import logging
 import os
 _logger = logging.getLogger(__name__)
@@ -31,6 +30,7 @@ class AbstractFSTask(AbstractTask):
     _name = None
     _key = None
     _synchronize_type = None
+    _default_port = None
 
     def __init__(self, env, config):
         self.env = env
@@ -53,7 +53,7 @@ class AbstractFSTask(AbstractTask):
         """open and read given file into create_file method,
            move file if move_directory is given"""
         with fs_conn.open(self._source_name(download_directory, file_name),
-                           "rb") as fileobj:
+                          "rb") as fileobj:
             data = fileobj.read()
         return self.create_file(file_name, data)
 
@@ -127,7 +127,8 @@ class AbstractFSTask(AbstractTask):
     def _target_name(self, fs_conn, upload_directory, filename):
         return os.path.join(upload_directory, filename)
 
-    def _upload_file(self, conn, host, port, user, pwd, path, filename, filedata):
+    def _upload_file(self, conn, host, port, user, pwd, 
+                     path, filename, filedata):
         upload_directory = path or '.'
         target_name = self._target_name(conn,
                                         upload_directory,
diff --git a/external_file_location/tasks/filestore.py b/external_file_location/tasks/filestore.py
index 8dce3d52..6278e6e5 100644
--- a/external_file_location/tasks/filestore.py
+++ b/external_file_location/tasks/filestore.py
@@ -21,11 +21,8 @@
 
 from .abstract_fs import AbstractFSTask
 from base64 import b64decode
-import fs
 from fs.osfs import OSFS
-from ftputil.error import FTPIOError
 import logging
-import os
 _logger = logging.getLogger(__name__)
 
 
@@ -70,12 +67,12 @@ class FileStoreExportTask(FileStoreTask):
         for attachment in self.attachment_ids:
             if attachment.state in ('pending', 'failed'):
                 self.attachment_id = attachment
-                with OSFS(host) as fs_conn:
+                with OSFS(self.host) as fs_conn:
                     self._upload_file(fs_conn,
-                                      self.host, 
-                                      self.port, 
-                                      self.user, 
+                                      self.host,
+                                      self.port,
+                                      self.user,
                                       self.pwd,
                                       self.path,
                                       attachment.datas_fname,
-                                  b64decode(attachment.datas))
+                                      b64decode(attachment.datas))
diff --git a/external_file_location/tasks/ftp.py b/external_file_location/tasks/ftp.py
index 2e58493a..37477b5f 100644
--- a/external_file_location/tasks/ftp.py
+++ b/external_file_location/tasks/ftp.py
@@ -23,7 +23,6 @@ from .abstract_fs import AbstractFSTask
 from base64 import b64decode
 from fs.ftpfs import FTPFS
 import logging
-import os
 _logger = logging.getLogger(__name__)
 
 
@@ -68,7 +67,7 @@ class FtpExportTask(FtpTask):
         for attachment in self.attachment_ids:
             if attachment.state in ('pending', 'failed'):
                 self.attachment_id = attachment
-                with FTPFS(self.host, self.user, self.pwd, 
+                with FTPFS(self.host, self.user, self.pwd,
                            port=self.port) as ftp_conn:
                     self._upload_file(ftp_conn, self.host, self.port,
                                       self.user,
diff --git a/external_file_location/tasks/sftp.py b/external_file_location/tasks/sftp.py
index 1f62472f..e061c3cc 100644
--- a/external_file_location/tasks/sftp.py
+++ b/external_file_location/tasks/sftp.py
@@ -23,7 +23,6 @@ from .abstract_fs import AbstractFSTask
 from base64 import b64decode
 from fs.sftpfs import SFTPFS
 import logging
-import os
 _logger = logging.getLogger(__name__)
 
 
@@ -72,9 +71,8 @@ class SftpExportTask(SftpTask):
             if attachment.state in ('pending', 'failed'):
                 self.attachment_id = attachment
                 connection_string = "{}:{}".format(self.host, self.port)
-                root = "/home/{}".format(self.user)
-                with SFTPFS(connection=connection_string, root_path=root,
-                            username=self.user, 
+                with SFTPFS(connection=connection_string,
+                            username=self.user,
                             password=self.pwd) as sftp_conn:
                     self._upload_file(sftp_conn, self.host, self.port,
                                       self.user,