template/unknown-filter

A Template calls a filter, test or function that neither Jinja nor yuanme has, a macro its import doesn’t define, or a method: Templates have no methods, such as Python’s .lower().

Example

{{ entry.date | date_format(format="%Y") }}

Fix

Correct the name, here dateformat, or use the filter a method’s help names, such as | lower. yuanme adds sort_by, dateformat, url, absolute_url, pluralize, attrs, markdown and org to Jinja’s own.