Constant name error undefined in custom template tags

Hello,

I'm creating a template tag that will will allow session variables stored as strings or
dict in a view to be available in its template. The syntax is:

{% session_value [view_name] [session_variable] [arg] %}

But at the moment I don't know how I can get Django to stop throwing name errors
on variables/class names that are available. In my code, kwargs, NoReverseMatch are all available, but
Django keeps reporting name errors on them.

Here's the snippet of the code at https://github.com/charyorde/session_value/blob/master/templatetags/tags.py

bits = token.split_contents()
    if len(bits) < 2:
        raise TemplateSyntaxError("'%s' takes at least one argument"
                                  " (path to a view)" % bits[0])
    view_name = bits[1]
    session_variable = '' # or args - bits at session_variable
    kwargs = None # bits as argument to session_variable
   
    return SessionNode(view_name, session_variable, kwargs, legacy_view_name=True)
session_value = register.tag(session_value)
   
class SessionNode(template.Node):
    def __init__(self, view_name, session_variable, kwargs=None, legacy_view_name=True): #session_variable is used as args
        self.view_name = view_name
        self.session_variable = session_variable
        #self.args = args
        if kwargs is not None:
            self.kwargs = kwargs
        if not legacy_view_name:
            self.legacy_view_name = legacy_view_name

I will like to know what I'm doing wrong. How do I prevent these constant name errors whenever the
template tag is registered?

Thanks
--
Odeyemi 'Kayode O.
http://www.sinati.com. t: @charyorde

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