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Duplicate of # 21960
avatar rkbundy
30 Oct 2018

Steps to reproduce the issue

Installing Joomla 3.9 (from 3.8.13) using built-in Joomla Update. Clicked normal blue "Install the Update" button.

Expected result

Notice of successful upgrade from 3.8.13 to 3.9.0

Actual result

Receive error message: "Error: 0 Class 'JToolbarHelper not found'. There is a button to return to the Control Panel. Pushing the button just re-displays the same screen. Joomla menu is visible (System, Users, Menu, etc.). No matter what option I select, this same screen re-displays.

System information (as much as possible)

From Joomla Update log file:

2018-10-30T15:16:44+00:00 INFO update Update started by user Super User (XXX). Old version is 3.8.13.
2018-10-30T15:16:46+00:00 INFO update Downloading update file from
2018-10-30T15:17:02+00:00 INFO update File downloaded.
2018-10-30T15:17:03+00:00 INFO update Starting installation of new version.

Additional comments

Website is still running apparently okay. But no access to the backend to maintain.

avatar rkbundy rkbundy - open - 30 Oct 2018
avatar joomla-cms-bot joomla-cms-bot - labeled - 30 Oct 2018
avatar joomla-cms-bot joomla-cms-bot - edited - 30 Oct 2018
avatar joomla-cms-bot joomla-cms-bot - change - 30 Oct 2018
Status New Closed
Closed_Date 0000-00-00 00:00:00 2018-10-30 16:05:50
Closed_By joomla-cms-bot
avatar joomla-cms-bot joomla-cms-bot - close - 30 Oct 2018
avatar joomla-cms-bot
joomla-cms-bot - comment - 30 Oct 2018

Set to "closed" on behalf of @Quy by The JTracker Application at

avatar Quy Quy - change - 30 Oct 2018
Status Closed Duplicate Report
Closed_By joomla-cms-bot Quy
Rel_Number 0 21960
Relation Type Duplicate of
avatar Quy
Quy - comment - 30 Oct 2018

Duplicate #21960

This comment was created with the J!Tracker Application at

avatar joeforjoomla
joeforjoomla - comment - 30 Oct 2018

I pointed this out several months ago. There was a release blocker label on #21960

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