diff --git a/webnotes/hooks.txt b/webnotes/hooks.txt
index 769619f150..377302f4fd 100644
--- a/webnotes/hooks.txt
+++ b/webnotes/hooks.txt
@@ -18,6 +18,8 @@ web_include_css = assets/css/webnotes-web.css
 web_include_js = website_script.js
 web_include_css = style_settings.css
 
+website_clear_cache = webnotes.templates.generators.website_group.clear_cache
+
 website_group_handler:Forum = webnotes.templates.website_group.forum
 website_group_handler:Events = webnotes.templates.website_group.events
 website_group_handler:Tasks = webnotes.templates.website_group.tasks
diff --git a/webnotes/templates/generators/website_group.py b/webnotes/templates/generators/website_group.py
index 0badc16a9b..0f8d366f42 100644
--- a/webnotes/templates/generators/website_group.py
+++ b/webnotes/templates/generators/website_group.py
@@ -3,6 +3,7 @@
 
 import webnotes
 from webnotes.webutils import get_access, render_blocks, can_cache
+from webnotes.templates.website_group.post import clear_post_cache
 
 doctype = "Website Group"
 no_cache = 1
@@ -101,3 +102,23 @@ def has_access(group, view):
 		return access.get("write")
 	else:
 		return access.get("read")
+		
+def clear_cache(page_name=None, website_group=None):
+	if page_name or website_group:
+		filters = {"page_name": page_name} if page_name else website_group
+
+		website_group = webnotes.conn.get_value("Website Group", filters,
+			["page_name", "group_type"], as_dict=True)
+
+		if not website_group:
+			return
+
+		website_groups = [website_group]
+	else:
+		clear_post_cache()
+		website_groups = webnotes.conn.sql("""select page_name, group_type from `tabWebsite Group`""", as_dict=True)
+	
+	cache = webnotes.cache()
+	for group in website_groups:
+		for view in get_views(group.group_type):
+			cache.delete_value("website_group_context:{}:{}".format(group.page_name, view))
diff --git a/webnotes/templates/pages/error.html b/webnotes/templates/pages/error.html
index 71f1c1d913..89cde84b89 100644
--- a/webnotes/templates/pages/error.html
+++ b/webnotes/templates/pages/error.html
@@ -8,6 +8,6 @@
 
 {% block content %}
 <div class="error-content">
-	<pre>%(error)s</pre>
+	<pre>{{ error }}</pre>
 </div>
 {% endblock %}
\ No newline at end of file
diff --git a/webnotes/templates/pages/error.py b/webnotes/templates/pages/error.py
index 0bbaabfe5c..6e7b8c097d 100644
--- a/webnotes/templates/pages/error.py
+++ b/webnotes/templates/pages/error.py
@@ -9,4 +9,7 @@ no_cache = 1
 no_sitemap = 1
 
 def get_context(context):
-	return render_blocks(context)
+	error_context = {"error": webnotes.get_traceback()}
+	error_context.update(context)
+	
+	return render_blocks(error_context)
diff --git a/webnotes/templates/website_group/post.py b/webnotes/templates/website_group/post.py
index 32a42796fa..9071ea1365 100644
--- a/webnotes/templates/website_group/post.py
+++ b/webnotes/templates/website_group/post.py
@@ -9,15 +9,19 @@ def get_post_context(group_context):
 	post = webnotes.doc("Post", webnotes.form_dict.name)
 	if post.parent_post:
 		raise webnotes.PermissionError
+		
+	def _get_post_context():
+		fullname = get_fullname(post.owner)
+		return {
+			"title": "{} by {}".format(post.title, fullname),
+			# "group_title": group_context.get("unit_title") + " by {}".format(fullname),
+			"parent_post_html": get_parent_post_html(post, group_context.get("view")),
+			"post_list_html": get_child_posts_html(post, group_context.get("view")),
+			"parent_post": post.name
+		}
 	
-	fullname = get_fullname(post.owner)
-	return {
-		"title": "{} by {}".format(post.title, fullname),
-		# "group_title": group_context.get("unit_title") + " by {}".format(fullname),
-		"parent_post_html": get_parent_post_html(post, group_context.get("view")),
-		"post_list_html": get_child_posts_html(post, group_context.get("view")),
-		"parent_post": post.name
-	}
+	cache_key = "website_group_post:".format(post.name)
+	return webnotes.cache().get_value(cache_key, lambda: _get_post_context())
 	
 def get_parent_post_html(post, view):
 	profile = webnotes.bean("Profile", post.owner).doc
@@ -38,4 +42,11 @@ def get_child_posts_html(post, view):
 			"posts": posts,
 			"parent_post": post.name,
 			"view": view
-		})
\ No newline at end of file
+		})
+		
+def clear_post_cache(post=None):
+	cache = webnotes.cache()
+	posts = [post] if post else webnotes.conn.sql_list("select name from `tabPost`")
+
+	for post in posts:
+		cache.delete_value("website_group_post:{}".format(post))
\ No newline at end of file
diff --git a/webnotes/website/doctype/blog_post/blog_post.py b/webnotes/website/doctype/blog_post/blog_post.py
index b54754473b..3cc1816bb0 100644
--- a/webnotes/website/doctype/blog_post/blog_post.py
+++ b/webnotes/website/doctype/blog_post/blog_post.py
@@ -4,7 +4,7 @@
 from __future__ import unicode_literals
 
 import webnotes
-from webnotes.webutils import WebsiteGenerator, cleanup_page_name, delete_page_cache
+from webnotes.webutils import WebsiteGenerator, cleanup_page_name, clear_cache
 from webnotes import _
 from webnotes.utils import today
 
@@ -29,11 +29,11 @@ class DocType(WebsiteGenerator):
 
 	def on_update(self):
 		WebsiteGenerator.on_update(self)
-		delete_page_cache("writers")
+		clear_cache("writers")
 
 def clear_blog_cache():
 	for blog in webnotes.conn.sql_list("""select page_name from 
 		`tabBlog Post` where ifnull(published,0)=1"""):
-		delete_page_cache(blog)
+		clear_cache(blog)
 	
-	delete_page_cache("writers")
+	clear_cache("writers")
diff --git a/webnotes/website/doctype/post/post.py b/webnotes/website/doctype/post/post.py
index 86863330e3..5ff8b7874a 100644
--- a/webnotes/website/doctype/post/post.py
+++ b/webnotes/website/doctype/post/post.py
@@ -12,10 +12,8 @@ from webnotes.utils.email_lib import sendmail
 from webnotes.utils.file_manager import save_file
 
 from webnotes.webutils import get_access
-
-# TODO move these functions to framework
-# from aapkamanch.post import clear_post_cache
-# from aapkamanch.unit import clear_unit_views
+from webnotes.templates.generators.website_group import clear_cache
+from webnotes.templates.website_group.post import clear_post_cache
 
 class DocType:
 	def __init__(self, d, dl):
@@ -44,8 +42,8 @@ class DocType:
 			self.doc.event_datetime = None
 			
 	def on_update(self):
-		# clear_unit_views(self.doc.website_group)
-		# clear_post_cache(self.doc.parent_post or self.doc.name)
+		clear_cache(website_group=self.doc.website_group)
+		clear_post_cache(self.doc.parent_post or self.doc.name)
 
 		if self.doc.assigned_to and self.doc.assigned_to != self.assigned_to \
 			and webnotes.session.user != self.doc.assigned_to:
@@ -181,7 +179,7 @@ def process_picture(post, picture_name, picture):
 	file_data = save_file(picture_name, picture, "Post", post.doc.name, decode=True)
 	post.doc.picture_url = file_data.file_name or file_data.file_url
 	webnotes.conn.set_value("Post", post.doc.name, "picture_url", post.doc.picture_url)
-	# clear_unit_views(post.doc.website_group)
+	clear_cache(website_group=post.doc.website_group)
 	
 @webnotes.whitelist()
 def suggest_user(group, term):
diff --git a/webnotes/website/doctype/website_sitemap/website_sitemap.py b/webnotes/website/doctype/website_sitemap/website_sitemap.py
index e47929be88..ebfeb33d63 100644
--- a/webnotes/website/doctype/website_sitemap/website_sitemap.py
+++ b/webnotes/website/doctype/website_sitemap/website_sitemap.py
@@ -52,14 +52,14 @@ class DocType(DocTypeNestedSet):
 				self.doc.public_read = self.doc.public_write = 0
 				
 	def on_trash(self):
-		from webnotes.webutils import delete_page_cache
+		from webnotes.webutils import clear_cache
 		
 		# remove website sitemap permissions
 		to_remove = webnotes.conn.sql_list("""select name from `tabWebsite Sitemap Permission` 
 			where website_sitemap=%s""", (self.doc.name,))
 		webnotes.delete_doc("Website Sitemap Permission", to_remove, ignore_permissions=True)
 		
-		delete_page_cache(self.doc.name)
+		clear_cache(self.doc.name)
 		
 def add_to_sitemap(options):
 	bean = webnotes.new_bean("Website Sitemap")
diff --git a/webnotes/website/doctype/website_sitemap_permission/website_sitemap_permission.py b/webnotes/website/doctype/website_sitemap_permission/website_sitemap_permission.py
index 5de997cfcb..299f82fcea 100644
--- a/webnotes/website/doctype/website_sitemap_permission/website_sitemap_permission.py
+++ b/webnotes/website/doctype/website_sitemap_permission/website_sitemap_permission.py
@@ -68,9 +68,11 @@ def _get_access(sitemap_page, profile):
 
 	return { "read": read, "write": write, "admin": admin, "private_read": private_read }
 
-def clear_permissions(profiles):
+def clear_permissions(profiles=None):
 	if isinstance(profiles, basestring):
 		profiles = [profiles]
+	elif profiles is None:
+		profiles = webnotes.conn.sql_list("""select name from `tabProfile`""")
 	
 	cache = webnotes.cache()
 	for profile in profiles:
diff --git a/webnotes/webutils.py b/webnotes/webutils.py
index 776c471ce3..b90b573a9d 100644
--- a/webnotes/webutils.py
+++ b/webnotes/webutils.py
@@ -13,8 +13,10 @@ from urllib import quote
 
 import mimetypes
 from webnotes.website.doctype.website_sitemap.website_sitemap import add_to_sitemap, update_sitemap, remove_sitemap
+
+# frequently used imports (used by other modules)
 from webnotes.website.doctype.website_sitemap_permission.website_sitemap_permission \
-	import get_access
+	import get_access, clear_permissions
 
 class PageNotFoundError(Exception): pass
 
@@ -27,7 +29,6 @@ def render(page_name):
 	except Exception:
 		page_name = "error"
 		data = render_page(page_name)
-		data = insert_traceback(data)
 	
 	data = set_content_type(data, page_name)
 	webnotes._response.data = data
@@ -46,7 +47,9 @@ def render_page(page_name):
 			out = out.get("data")
 			
 	if out:
-		webnotes._response.headers[b"From Cache"] = True
+		if hasattr(webnotes, "_response"):
+			webnotes._response.headers[b"From Cache"] = True
+		
 		return out
 	
 	return build(page_name)
@@ -238,15 +241,6 @@ def scrub_page_name(page_name):
 		
 	return page_name
 
-def insert_traceback(data):
-	traceback = webnotes.get_traceback()
-	if isinstance(data, dict):
-		data["content"] = data["content"] % {"error": traceback}
-	else:
-		data = data % {"error": traceback}
-		
-	return data
-	
 def set_content_type(data, page_name):
 	if isinstance(data, dict):
 		webnotes._response.headers[b"Content-Type"] = b"application/json; charset: utf-8"
@@ -262,23 +256,27 @@ def set_content_type(data, page_name):
 	return data
 
 def clear_cache(page_name=None):
+	cache = webnotes.cache()
+	
 	if page_name:
 		delete_page_cache(page_name)
+		
 	else:
-		cache = webnotes.cache()
 		for p in webnotes.conn.sql_list("""select name from `tabWebsite Sitemap`"""):
 			if p is not None:
-				cache.delete_value("page:" + p)
-		cache.delete_value("home_page")
-		cache.delete_value("page:index")
-		cache.delete_value("website_sitemap")
-		cache.delete_value("website_sitemap_config")
+				delete_page_cache(p)
 		
+		cache.delete_value("home_page")
+		clear_permissions()
+	
+	for method in webnotes.get_hooks("website_clear_cache"):
+		webnotes.get_attr(method)(page_name)
+
 def delete_page_cache(page_name):
-	if page_name:
-		cache = webnotes.cache()
-		cache.delete_value("page:" + page_name)
-		cache.delete_value("website_sitemap")
+	cache = webnotes.cache()
+	cache.delete_value("page:" + page_name)
+	cache.delete_value("page_context:" + page_name)
+	cache.delete_value("sitemap_options:" + page_name)
 			
 def is_signup_enabled():
 	if getattr(webnotes.local, "is_signup_enabled", None) is None: