Article ID: 120209, created on Feb 18, 2014, last review on Jun 17, 2016

  • Applies to:
  • Plesk 12.5 for Linux
  • Plesk 12.0 for Linux
  • Plesk 11.0 for Linux
  • Plesk 11.5 for Linux
  • Plesk 12.5 for Windows
  • Plesk 12.0 for Windows
  • Plesk 11.0 for Windows
  • Plesk 11.5 for Windows


When the WordPress Install button is pressed (including the custom install option) in Application Vault, a progress bar is shown but never changes from 0%.

  1. Log into Plesk.

  2. Click "Tools & Utilities" > "Application Vault" > tab "My Apps".

  3. Try installing the app. Here, the notification bar shows: Please wait.... 0%

This bar may remain the same for several hours with nothing happening.


A large number of applications are stuck in the psa.longtasks table.


  1. Backup the psa database by following the instructions in KB #881

  2. Log into MySQL and access the psa database:


     MYSQL_PWD=`cat /etc/psa/.psa.shadow`  mysql -uadmin psa


    "%plesk_dir%"\MySQL\bin\mysql.exe -uadmin -p<Plesk Admin Password> psa -P8306
  3. Check the long tasks that are present on the server:

    mysql> select * from longtasks;
  4. Delete these tasks:

    mysql> truncate longtasks;
    mysql> truncate longtaskparams;
  5. Try installing the application again.

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