Problem vBulletin 4.2.5

[Adem GEN?]

Hello,

What might be the reason for the problems:

Call to undefined function mb_detect_encoding() on line 729 in /home/-----/Forum/includes/functions.php
#0 /home/-----/Forum/vb/activitystream/view/perm/forum/post.php(98): fetch_censored_text('tesekk\xC3\xBCrler')
#1 /home/-----/Forum/vb/activitystream/view.php(799): vB_ActivityStream_View_Perm_Forum_Post->fetchTemplate('activitystream_...', Array, false)
#2 /home/-----/Forum/vb/activitystream/view/home.php(223): vB_ActivityStream_View->fetchStream('recent')
#3 /home/-----/Forum/activity.php(101): vB_ActivityStream_View_Home->process()
#4 {main}

Apache v2.4.29
PHP 7.1.21
MySQL 5.6.35

Thank you in advance

[motd2]

You need to install the mb_string library in PHP.
http://php.net/manual/en/mbstring.installation.php

[Adem GEN?]

You need to install the mb_string library in PHP.
http://php.net/manual/en/mbstring.installation.php
Thank you very much, Problem solved