I'm using CKAN as my open data portal and am trying to install the ckanext-viewhelpers Extension by following the instructions at https://github.com/ckan/ckanext-viewhelpers.

/usr/lib/ckan/default/src/ckanext-viewhelpers-master$ sudo python setup.py installChecking .pth file support in /usr/local/lib/python2.7/dist-packages/

/usr/bin/python -E -c pass
TEST PASSED: /usr/local/lib/python2.7/dist-packages/ appears to support .pth files
running bdist_egg
running egg_info
writing ckanext_viewhelpers.egg-info/PKG-INFO
writing namespace_packages to ckanext_viewhelpers.egg-info/namespace_packages.txt
writing top-level names to ckanext_viewhelpers.egg-info/top_level.txt
writing dependency_links to ckanext_viewhelpers.egg-info/dependency_links.txt
writing entry points to ckanext_viewhelpers.egg-info/entry_points.txt
reading manifest file 'ckanext_viewhelpers.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'ckanext_viewhelpers.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-x86_64/egg
running install_lib
running build_py
creating build/bdist.linux-x86_64/egg
creating build/bdist.linux-x86_64/egg/ckanext
copying build/lib.linux-x86_64-2.7/ckanext/__init__.py -> build/bdist.linux-x86_64/egg/ckanext
creating build/bdist.linux-x86_64/egg/ckanext/viewhelpers
copying build/lib.linux-x86_64-2.7/ckanext/viewhelpers/plugin.py -> build/bdist.linux-x86_64/egg/ckanext/viewhelpers
copying build/lib.linux-x86_64-2.7/ckanext/viewhelpers/__init__.py -> build/bdist.linux-x86_64/egg/ckanext/viewhelpers
creating build/bdist.linux-x86_64/egg/ckanext/viewhelpers/tests
copying build/lib.linux-x86_64-2.7/ckanext/viewhelpers/tests/__init__.py -> build/bdist.linux-x86_64/egg/ckanext/viewhelpers/tests
copying build/lib.linux-x86_64-2.7/ckanext/viewhelpers/tests/test_view.py -> build/bdist.linux-x86_64/egg/ckanext/viewhelpers/tests
creating build/bdist.linux-x86_64/egg/ckanext/viewhelpers/public
creating build/bdist.linux-x86_64/egg/ckanext/viewhelpers/public/vendor
copying build/lib.linux-x86_64-2.7/ckanext/viewhelpers/public/vendor/queryStringToJSON.js -> build/bdist.linux-x86_64/egg/ckanext/viewhelpers/public/vendor
copying build/lib.linux-x86_64-2.7/ckanext/viewhelpers/public/resource.config -> build/bdist.linux-x86_64/egg/ckanext/viewhelpers/public
copying build/lib.linux-x86_64-2.7/ckanext/viewhelpers/public/filters_form.css -> build/bdist.linux-x86_64/egg/ckanext/viewhelpers/public
copying build/lib.linux-x86_64-2.7/ckanext/viewhelpers/public/filters.js -> build/bdist.linux-x86_64/egg/ckanext/viewhelpers/public
copying build/lib.linux-x86_64-2.7/ckanext/viewhelpers/public/filters_form.js -> build/bdist.linux-x86_64/egg/ckanext/viewhelpers/public
byte-compiling build/bdist.linux-x86_64/egg/ckanext/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-x86_64/egg/ckanext/viewhelpers/plugin.py to plugin.pyc
byte-compiling build/bdist.linux-x86_64/egg/ckanext/viewhelpers/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-x86_64/egg/ckanext/viewhelpers/tests/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-x86_64/egg/ckanext/viewhelpers/tests/test_view.py to test_view.pyc
creating build/bdist.linux-x86_64/egg/EGG-INFO
copying ckanext_viewhelpers.egg-info/PKG-INFO -> build/bdist.linux-x86_64/egg/EGG-INFO
copying ckanext_viewhelpers.egg-info/SOURCES.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying ckanext_viewhelpers.egg-info/dependency_links.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying ckanext_viewhelpers.egg-info/entry_points.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying ckanext_viewhelpers.egg-info/namespace_packages.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
copying ckanext_viewhelpers.egg-info/not-zip-safe -> build/bdist.linux-x86_64/egg/EGG-INFO
copying ckanext_viewhelpers.egg-info/top_level.txt -> build/bdist.linux-x86_64/egg/EGG-INFO
creating 'dist/ckanext_viewhelpers-0.1-py2.7.egg' and adding 'build/bdist.linux-x86_64/egg' to it
removing 'build/bdist.linux-x86_64/egg' (and everything under it)
Processing ckanext_viewhelpers-0.1-py2.7.egg
removing '/usr/local/lib/python2.7/dist-packages/ckanext_viewhelpers-0.1-py2.7.egg' (and everything under it)
creating /usr/local/lib/python2.7/dist-packages/ckanext_viewhelpers-0.1-py2.7.egg
Extracting ckanext_viewhelpers-0.1-py2.7.egg to /usr/local/lib/python2.7/dist-packages
ckanext-viewhelpers 0.1 is already the active version in easy-install.pth

Installed /usr/local/lib/python2.7/dist-packages/ckanext_viewhelpers-0.1-py2.7.egg
Processing dependencies for ckanext-viewhelpers==0.1
Finished processing dependencies for ckanext-viewhelpers==0.1

However I am faced with this error which I could not solve after adding viewhelpers in my CKAN config file.

paster serve /etc/ckan/default/development.ini

Traceback (most recent call last):
  File "/usr/bin/paster", line 4, in <module>
    command.run()
  File "/usr/lib/python2.7/dist-packages/paste/script/command.py", line 104, in run
    invoke(command, command_name, options, args[1:])
  File "/usr/lib/python2.7/dist-packages/paste/script/command.py", line 143, in invoke
    exit_code = runner.run(args)
  File "/usr/lib/python2.7/dist-packages/paste/script/command.py", line 238, in run
    result = self.command()
  File "/usr/lib/python2.7/dist-packages/paste/script/serve.py", line 284, in command
    relative_to=base, global_conf=vars)
  File "/usr/lib/python2.7/dist-packages/paste/script/serve.py", line 321, in loadapp
    **kw)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
    return loadobj(APP, uri, name=name, **kw)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 271, in loadobj
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 320, in _loadconfig
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 454, in get_context
    section)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 476, in _context_from_use
    object_type, name=use, global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 406, in get_context
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 328, in _loadegg
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 620, in get_context
    object_type, name=name)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 646, in find_egg_entry_point
    possible.append((entry.load(), protocol, entry.name))
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 1989, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/ckan/default/src/ckan/ckan/config/middleware.py", line 9, in <module>
    import sqlalchemy as sa
ImportError: No module named sqlalchemyckanext-viewhelpers