Files automated tagging Error log

Anyone else have erros opening Flow section in Nextcloud admin panel? If i open flow then log shows me error.

Error

[jsresourceloader] Error: Could not find resource core/js/oc-backbone-webdav.js to load
GET /index.php/settings/admin/workflow
from x.x.x.x by user-ID at 2020-05-26T12:37:12+03:00

But script working only if open setting comes this error.

Server stats:
PHP 7.2.11
NC: 18.0.4
Apache: 2.4.37 (CentOS 8)