Pathologic was missing because of a .git folder inside.

[yaffs-website] / web / modules / contrib / diff / diff.info.yml

name: Diff
type: module
description: Shows changes between content revisions.
# core: 8.x
configure: diff.general_settings

# Information added by Drupal.org packaging script on 2017-01-16
version: '8.x-1.0-rc1'
core: '8.x'
project: 'diff'
datestamp: 1484566687