Plesk extensions are malfunctioning: Error in line 74: local complex type: The content model is not determinist.

Symptoms

• Various Plesk extensions are malfunctioning:

  • Laravel Toolkit: Unable to install the extension or scan instances with already installed extension

  • PHP Composer: Unable to scan for applications or install dependencies

  • Git: Unable to open the extension or perform any actions in it

  • WP Toolkit: Various actions fail

    with one of the following error messages:

    PLESK_ERROR: ERR [panel] XML-RPC: Request is invalid. Error in line 74: local complex type: The content model is not determinist.

    ---

    PLESK_ERROR: ERR [extension/dnssec] pm_Exception: Parser error: Request is invalid. Error in line 74: local complex type: The content model is not determinist.

• ImunifyAV extension shows this error in Plesk: 

  PLESK_ERROR: Error: ImunifyAV requires PHP version 7.0 - 8.0. Currently, we cannot find any suitable PHP version on your server to run scripts. Please, configure it in the Settings of Plesk panel.

Cause

The packages libxml2-2.12.1-1.0.cf.rhel7.x86_64, libcurl-8.2.1-4.0.cf.rhel7.x86_64 and python2-libxml2-2.12.1-1.0.cf.rhel7.x86_64 have been updated from a custom repository CityFan. These packages are not supported by Plesk.

Resolution

Downgrade the packages to a supported version that comes from default OS .

1. For safety reasons, create a snapshot of the server

2. Connect to the Plesk server via SSH

3. List the yum operations related to the mentioned packages, e.g.:

   # yum history list libxml2
   Loaded plugins: fastestmirror, priorities
   ID | Login user | Date and time | Action(s) | Altered
   -------------------------------------------------------------------------------
   578 | root <root> | 2023-12-02 16:47 | I, O, U | 54
   2 | 1000 | 2022-06-16 09:43 | I, U | 5
   1 | System <unset> | 2022-06-16 09:36 | Install | 252
   history list

   # yum history list python2-libxml2
   Loaded plugins: fastestmirror, priorities
   ID | Command line | Date and time | Action(s) | Altered
   -------------------------------------------------------------------------------
   578 | update | 2023-12-02 16:47 | I, O, U | 54
   history list

4. Undo the update using the ID:

   # yum history undo 578

If yum history undo operation fails, try:

1. Disable CityFan repos:

   # grep -Ril city-fan /etc/yum.repos.d/ |xargs -i mv {} ~

2. Download packages from epel/updates:

   # mkdir ~/epelXml && cd ~/epelXml
   # yum makecache
   # curl -LO http://mirror.centos.org/centos/7/os/x86_64/Packages/libxslt-1.1.28-6.el7.x86_64.rpm
   # curl -LO http://mirror.centos.org/centos/7/updates/x86_64/Packages/libxml2-2.9.1-6.el7_9.6.x86_64.rpm
   # curl -LO http://mirror.centos.org/centos/7/os/x86_64/Packages/libcurl-7.29.0-59.el7.x86_64.rpm
   # curl -LO http://mirror.centos.org/centos/7/updates/x86_64/Packages/libxml2-python-2.9.1-6.el7_9.6.x86_64.rpm

3. Remove the packages installed from CityFan repo:

   # printf "libxml2\npython2-libxml2\nlibxslt\n" |xargs -i rpm -e --nodeps {}

4. Manually install the downloaded packages from epel/updates(libxml2, libxml2-python, libxslt):

   # ls |xargs -i rpm -ivh {}

5. Restart the Plesk services:

   # service sw-cp-server restart && service sw-engine restart