python - Unknown predicate values error while rendering mako template in pyramid -

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i getting configurationerror('unknown predicate values: %r' % (kw,)) while rendering mako template. below structure of pyramid project.

my pyramid project tree.

|-- web |-- myweb     |-- templates         |-- index.mak     |-- __init__.py     |-- views.py |-- development.ini |-- production.ini

web/myweb/views.py

class main(object): def __init__(self, request):     self.request = request def __call__(self):     return {}

web/myweb/__init__.py

config.add_route('main', '/',                  view='myweb.views.main',                  renderer='index.mako')

this getting error such 

 raise configurationerror('unknown predicate values: %r' % (kw,))  pyramid.exceptions.configurationexecutionerror: <class   pyramid.exceptions.configurationerror'>: unknown predicate values: {'renderer': 'index.mako', 'view': 'myweb.views.main'}   in: line 33 of file /home/user/project/web/myweb/__init__.py: renderer='index.mako')

here .ini files

development.ini

[app:myweb] mako.directories = web:myweb:templates

production.ini

[app:myweb] mako.directories = web:myweb:templates

i don't know missing , cause of error.

to state obvious, __init__.py refers template "index.mako" whereas file called "index.mak".


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