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[ian <1843210@xxxxxxxxxxxxxxxxxx>]

NB, I updated another site on the same server and now that has the same
issue. (this was test site with hardly any content).

Here is a trace of the error

[WAR] cc (artefact/comment/lib.php:1187) Use of undefined constant LIBXML_HTML_NOIMPLIED - assumed 'LIBXML_HTML_NOIMPLIED'
Call stack (most recent first):

    log_message(string(size 81), integer, true, true, string(size 52), integer) at /home/tdmmahara/public_html/lib/errors.php:520
    error(integer, string(size 81), string(size 52), integer, array(size 2)) at /home/tdmmahara/public_html/artefact/comment/lib.php:1187
    ArtefactTypeComment::remove_comments_classes(string(size 10)) at /home/tdmmahara/public_html/artefact/comment/lib.php:1640
    add_feedback_form_submit(object(Pieform), array(size 7)) at /home/tdmmahara/public_html/lib/pieforms/pieform.php:544
    Pieform->__construct(array(size 9)) at /home/tdmmahara/public_html/lib/pieforms/pieform.php:166
    Pieform::process(array(size 9)) at /home/tdmmahara/public_html/lib/mahara.php:5400
    pieform(array(size 9)) at /home/tdmmahara/public_html/view/view.php:266

[WAR] cc (artefact/comment/lib.php:1187) Use of undefined constant LIBXML_HTML_NODEFDTD - assumed 'LIBXML_HTML_NODEFDTD'
Call stack (most recent first):

    log_message(string(size 79), integer, true, true, string(size 52), integer) at /home/tdmmahara/public_html/lib/errors.php:520
    error(integer, string(size 79), string(size 52), integer, array(size 2)) at /home/tdmmahara/public_html/artefact/comment/lib.php:1187
    ArtefactTypeComment::remove_comments_classes(string(size 10)) at /home/tdmmahara/public_html/artefact/comment/lib.php:1640
    add_feedback_form_submit(object(Pieform), array(size 7)) at /home/tdmmahara/public_html/lib/pieforms/pieform.php:544
    Pieform->__construct(array(size 9)) at /home/tdmmahara/public_html/lib/pieforms/pieform.php:166
    Pieform::process(array(size 9)) at /home/tdmmahara/public_html/lib/mahara.php:5400
    pieform(array(size 9)) at /home/tdmmahara/public_html/view/view.php:266

[WAR] cc (artefact/comment/lib.php:1187) DOMDocument::loadHTML() expects parameter 2 to be integer, string given
Call stack (most recent first):

    log_message(string(size 71), integer, true, true, string(size 52), integer) at /home/tdmmahara/public_html/lib/errors.php:520
    error(integer, string(size 71), string(size 52), integer, array(size 2)) at Unknown:0
    DOMDocument->loadHTML(string(size 10), string(size 21)) at /home/tdmmahara/public_html/artefact/comment/lib.php:1187
    ArtefactTypeComment::remove_comments_classes(string(size 10)) at /home/tdmmahara/public_html/artefact/comment/lib.php:1640
    add_feedback_form_submit(object(Pieform), array(size 7)) at /home/tdmmahara/public_html/lib/pieforms/pieform.php:544
    Pieform->__construct(array(size 9)) at /home/tdmmahara/public_html/lib/pieforms/pieform.php:166
    Pieform::process(array(size 9)) at /home/tdmmahara/public_html/lib/mahara.php:5400
    pieform(array(size 9)) at /home/tdmmahara/public_html/view/view.php:266

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https://bugs.launchpad.net/bugs/1843210

Title:
  Cannot add comments in a page

Status in Mahara:
  New

Bug description:
  Hi,

  When I added a comment by clicking the "Comment" button in a page, all
  the contents of my comments were gone and just an empty comment was
  shown (See the attached screenshot).

  I edited and added some text again to this empty comment, it still did
  not work. It seems that the comments cannot be saved.

  I also tried to setup new sites for testing, tested both versions
  19.04.0 and 19.04.01, the problem is still there.

  My server environment:
  Red Hat (RHEL) 6.10
  Apache 2.4.39
  PHP 7.2.19
  MariaDB 10.2.16

  Would you please help to check?

  Thanks.

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