diff --git a/.gitignore b/.gitignore
index 7d59b58..40ae560 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,6 @@ htmlcov/
 .coverage
 .cache
 .idea/
+build
+dist
+*.egg-info
\ No newline at end of file
diff --git a/seafileapi/client.py b/seafileapi/client.py
index 9c245fd..5b4134e 100644
--- a/seafileapi/client.py
+++ b/seafileapi/client.py
@@ -1,4 +1,5 @@
 import requests
+from json.decoder import JSONDecodeError
 from seafileapi.utils import urljoin
 from seafileapi.exceptions import ClientHttpError
 from seafileapi.repos import Repos
@@ -96,7 +97,11 @@ def _send_request(self, method, url, *args, **kwargs):
             expected = (expected,)
         resp = requests.request(method, url, **kwargs)
         if resp.status_code not in expected:
-            msg = 'Expected {}, but get {}'.format(' or '.join(map(str, expected)), resp.status_code)
+            try:
+                err = resp.json().get('error_msg', 'Unknown')
+            except JSONDecodeError:
+                err = 'Unknown'
+            msg = 'Expected {}, but got {}. Error Message: {}'.format(' or '.join(map(str, expected)), resp.status_code, err )
             raise ClientHttpError(resp.status_code, msg)
 
         return resp
diff --git a/seafileapi/groups.py b/seafileapi/groups.py
index c91fd3f..c28adc9 100644
--- a/seafileapi/groups.py
+++ b/seafileapi/groups.py
@@ -40,6 +40,7 @@ class Group:
     """
     GROUPS_URL = '/api/v2.1/groups/{}/'
     GROUP_MEMBERS_URL = '/api/v2.1/groups/{}/members/{}'
+    GROUP_MEMBERS_BULK_URL = '/api/v2.1/groups/{}/members/bulk'
     GROUP_MESSAGES_URL = '/api2/groups/{}/discussions/{}'
     __slots__ = ('client', 'id', 'name', 'owner', 'created_at', 'admins', 'avatar_url', 'wiki_enabled')
 
@@ -106,10 +107,23 @@ def get_member(self, email):
 
     def list_members(self):
         """
+        Get all members from a group
+
+        Note: Endpoint uses paging
+        Ref: https://github.com/haiwen/seahub/blob/master/seahub/api2/endpoints/group_members.py#L56
 
         :return:
         """
-        members = self.client.get(self.GROUP_MEMBERS_URL.format(self.id, '')).json()
+        page=1
+        per_page=100
+        members = []
+        while True:
+            res = self.client.get(self.GROUP_MEMBERS_URL.format(
+                self.id, ''), params={"page": page, "per_page": per_page}).json()
+            members += res
+            page += 1
+            if len(res) < per_page:
+                break
         return [Member(self.client, **member) for member in members] if members else []
 
     def add_member(self, email):
@@ -121,13 +135,24 @@ def add_member(self, email):
         res = self.client.post(self.GROUP_MEMBERS_URL.format(self.id, ''), data={'email': email}).json()
         return self.get_member(res['email'])
 
-    def add_members(self):
+    def add_members(self, emails):
+        """
+
+        :param emails:
+        :return:
+        """
+        res = self.client.post(self.GROUP_MEMBERS_BULK_URL.format(self.id, ''), data={'emails': ','.join(emails)}).json()
+        # TODO Return 'failed' members as well?
+        return [self.get_member(member['email']) for member in res['success']]
+
+    def delete_member(self, email):
         """
 
         :param email:
         :return:
         """
-        raise NotImplemented
+        res = self.client.delete(self.GROUP_MEMBERS_URL.format(self.id, email)).json()
+        return bool(res['success'])
 
     def list_messages(self):
         """
diff --git a/setup.py b/setup.py
index b75405d..85f8523 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 from setuptools import setup, find_packages
 
-__version__ = '0.1.2'
+__version__ = '0.1.3'
 
 
 setup(name='seafileapi',
diff --git a/tests/test_groups.py b/tests/test_groups.py
index 911a03f..5e24017 100644
--- a/tests/test_groups.py
+++ b/tests/test_groups.py
@@ -27,6 +27,11 @@ def test_members(group, test_account1, test_account2):
     member2.delete()
     assert member2 not in group.list_members()
 
+    member1.delete()
+    member2.delete()
+    members = group.add_members([test_account1.email, test_account2.email])
+    assert member1 in group.list_members() and member2 in group.list_members()
+
 
 def test_messages(group, test_account1, test_account2):
     member1 = group.add_member(test_account1.email)