title: Can't load jinja2 with webapp2/Google App Engine
body: <p>I'm going through the GAE webapp2 tutorial (runtime 2.7) using GoogleAppEngineLauncher on my Mac, and though I'm following everything exactly, I keep on getting an error at the point where we import the Jinja2 module: <a href="http://code.google.com/appengine/docs/python/gettingstartedpython27/templates.html" rel="noreferrer">Using Templates - Google App Engine</a></p>
  
  <p><strong>Error:</strong></p>
  
  <blockquote>
    <p>Traceback (most recent call last): File
    "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py",
    line 168, in Handle handler =
    _config_handle.add_wsgi_middleware(self._LoadHandler()) File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py",
    line 206, in _LoadHandler handler = import(path[0]) File
    "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver_import_hook.py",
    line 640, in Decorate return func(self, *args, **kwargs) File
    "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver_import_hook.py",
    line 1756, in load_module return self.FindAndLoadModule(submodule,
    fullname, search_path) File
    "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver_import_hook.py",
    line 640, in Decorate return func(self, *args, **kwargs) File
    "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver_import_hook.py",
    line 1628, in FindAndLoadModule description) File
    "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver_import_hook.py",
    line 640, in Decorate return func(self, *args, **kwargs) File
    "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver_import_hook.py",
    line 1571, in LoadModuleRestricted description) File
    "/Users/ykessler/Dropbox/appgrinders/gae_apps/helloworld2.7/helloworld.py",
    line 9, in import jinja2 ImportError: No module named jinja2</p>
  </blockquote>
  
  <p>So it for some reason can't find the module, even though it's supposed to be packaged as part of webapp2's extras. When I do a search on my file system it looks like it's there:</p>
  
  <pre><code>/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/webapp2/webapp2_extras/jinja2.py
  </code></pre>
  
  <p>And if I deploy the app to GAE, it works fine. Why would it be failing locally?</p>