Lintian tag information: doc-base-file-unknown-field (type: error)

Description (from lintian-explain-tags)

The doc-base control file contains a field that is either unknown or
invalid in the section in which it appears.

Possible reasons are a typo in field name, a missing empty line between
sections in the control file, or an extra empty line between sections.

Please refer to The main section (Section 2.3.2.1) in the Debian doc-base
Manual and Format sections (Section 2.3.2.2) in the Debian doc-base Manual
for details.

Visibility: error
Show-Always: no
Check: menus

Affected packages

source version binary tag type tag information count
chasen 2.4.5-44 chasen/2.4.5-44+b1 error doc-base-file-unknown-field FILES [usr/share/doc-base/chasen:8] 8
chasen 2.4.5-44 chasen/2.4.5-44+b1 error doc-base-file-unknown-field FILES [usr/share/doc-base/chasen.chasen:8] 1
nbsphinx 0.9.4+ds-1.1 python-nbsphinx-doc/0.9.4+ds-1.1 error doc-base-file-unknown-field #Files [usr/share/doc-base/python-nbsphinx-doc.nbsphinx:14] 1
nbsphinx 0.9.4+ds-1.1 python-nbsphinx-doc/0.9.4+ds-1.1 error doc-base-file-unknown-field #Format [usr/share/doc-base/python-nbsphinx-doc.nbsphinx:13] 1