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jinja2.exceptions.UndefinedError: list object has no element 0

点击任意新闻分类都显示此问题,已经添加了新闻,数据库中也显示有新闻。
`

jinja2.exceptions.UndefinedError: list object has no element 0
Traceback (most recent call last)

File "/home/keyes/.local/lib/python3.6/site-packages/flask/app.py", line 2309, in __call__

return self.wsgi_app(environ, start_response)

File "/home/keyes/.local/lib/python3.6/site-packages/flask/app.py", line 2295, in wsgi_app

response = self.handle_exception(e)

File "/home/keyes/.local/lib/python3.6/site-packages/flask/app.py", line 1741, in handle_exception

reraise(exc_type, exc_value, tb)

File "/home/keyes/.local/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise

raise value

File "/home/keyes/.local/lib/python3.6/site-packages/flask/app.py", line 2292, in wsgi_app

response = self.full_dispatch_request()

File "/home/keyes/.local/lib/python3.6/site-packages/flask/app.py", line 1815, in full_dispatch_request

rv = self.handle_user_exception(e)

File "/home/keyes/.local/lib/python3.6/site-packages/flask/app.py", line 1718, in handle_user_exception

reraise(exc_type, exc_value, tb)

File "/home/keyes/.local/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise

raise value

File "/home/keyes/.local/lib/python3.6/site-packages/flask/app.py", line 1813, in full_dispatch_request

rv = self.dispatch_request()

File "/home/keyes/.local/lib/python3.6/site-packages/flask/app.py", line 1799, in dispatch_request

return self.view_functions[rule.endpoint](**req.view_args)

File "/home/keyes/Desktop/BigNews-1/index.py", line 65, in catalogue

return render_template('catalogue.html',**content)

File "/home/keyes/.local/lib/python3.6/site-packages/flask/templating.py", line 135, in render_template

context, ctx.app)

File "/home/keyes/.local/lib/python3.6/site-packages/flask/templating.py", line 117, in _render

rv = template.render(context)

File "/home/keyes/.local/lib/python3.6/site-packages/jinja2/asyncsupport.py", line 76, in render

return original_render(self, *args, **kwargs)

File "/home/keyes/.local/lib/python3.6/site-packages/jinja2/environment.py", line 1008, in render

return self.environment.handle_exception(exc_info, True)

File "/home/keyes/.local/lib/python3.6/site-packages/jinja2/environment.py", line 780, in handle_exception

reraise(exc_type, exc_value, tb)

File "/home/keyes/.local/lib/python3.6/site-packages/jinja2/_compat.py", line 37, in reraise

raise value.with_traceback(tb)

File "/home/keyes/Desktop/BigNews-1/templates/catalogue.html", line 1, in top-level template code

{% extends 'base.html' %}

File "/home/keyes/Desktop/BigNews-1/templates/base.html", line 74, in top-level template code

{% block main %}{% endblock %}

File "/home/keyes/Desktop/BigNews-1/templates/catalogue.html", line 27, in block "main"

<a href="{{url_for('newsPage',newsId=newss[0].pid)}}">

File "/home/keyes/.local/lib/python3.6/site-packages/jinja2/environment.py", line 430, in getattr

return getattr(obj, attribute)

jinja2.exceptions.UndefinedError: list object has no element 0

`

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