python - Django App (treeio) error on PDF Generation -

This is the error that I am getting when I generate a PDF for any page ... any suggestions What is it?

Every time I press the button of PDF, it returns a file and then returns 500 error if I do DEBUG = FALSE if DEBUG = TRUE error occurs ...

> Environment: Request method: Get Request URL: http://example.com/sales/product/view/76.pdf Django Version: 1.5.1 Python Version: 2.7.8 Installed Application: ('django.contrib .auth', 'django.contrib.contenttypes',' django.contrib.sessions', 'django.contrib.sites',' django.contrib.admin ',' django.contrib.markup ',' Django_websocket ',' Django.contrib.messages ',' treeio.account ',' treeio.core ',' trio.core.app Iai 'Tryiokkorksserch' Tryoo documents' Tryoavents' Tryaofinens' 'Tryio Islands' Tryoioifrastrccr' Tryio. Knowledge ',' Tryio. Messaging 'Tryio. News 'Tryio Pirojekts' Tryoaarports' Tryoosles' Tr Eeiokservices' Dajaxice' Dajax 'coffin', 'Captcha', the 'South') Middleware: ( 'django.contrib .sessions.middleware.SessionMiddleware ',' treeio.core.middleware.user. AuthMiddleware ',' django.contrib.auth.middleware.AuthenticationMiddleware ',' treeio.core.middleware.user.LanguageMiddleware ',' django.middleware.locale.LocaleMiddleware ',' django.middleware.common.CommonMiddleware ',' Johnny. Midilveyrkloklstrclearmeeddlevre 'Jonikmidilveyrkkwerikachemidlware' Djngokmidilveyrkgzipkgzipmiddlevre 'Triiokkorkmidilveyrkugrksslmiddlevre' Djngokmidilveyrkksrfkksrfviawmiddlevre 'Triiokkor. Midilveyrkchatkctjshmiddlevre 'Djngokcontribkmessgeskmidilveyrkmessgemiddlevre' Triiokkorkmidilveyrkmodlskmodledetekt 'Minidetectorkmidilveyr' Triiokkorkmidilveyrkugrkcommonmiddlevre ' treeio.core.middleware.user.PopupMiddleware ') Traceback: file "/treeio/treeio/venv/lib/python2.7/site-packages/django/core/handlers/base.py" 121. in response get_response = Midlveyr_maleshn ( Request, e) file "/treeio/treeio/venv/lib/python2.7/site-packages/django/core/handlers/base.py" get_response 115. response = callback (request, * callback_args, ** callback_kwargs) file "/treeio/treeio/core/decorators.py" 48. In the wrap, return (request, * args, ** kwargs) file "/treeio/treeio/core/decorators.py" wrap 124. response = F (Request, * Args, ** kwargs) in the file "/treeio/treeio/sales/views.py" product_view 674 Render_to_response 154. f = codecs.open (source, encoding = 'utf-8', mode = 'w') in the file "/ treeio / treeio / core / rendering" Context_instance = RequestContext (request), response_format = response_format file " /usr/lib/python2.7/codecs.py "Open file = __biltin___ in open 878. (file name, mode, buffering) exception type: IOError at /sales/product/view/76.pdf Exception value: [Error 13] Permission denied: '/ tr Eeio / treeiobbaffc6da2ff9d79dbdbe7012437c4c0.html'