An error has occurred. 0 Class 'JToolbarHelper' not found

[Latos88]

Hello,

Please I have issue with my administrator joomla, when i want to access to Administrator panel I got this issue : An error has occurred.
0 Class 'JToolbarHelper' not found
Version 3.9.0

Thanks

[joomla-cms-bot]

Set to "closed" on behalf of @Quy by The JTracker Application at issues.joomla.org/joomla-cms/23078

[Quy]

Duplicate of #21960

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