Error when logging in Controller Block not found

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Hi there,
I changed my hoster for my concrete5 site (5.6.3.4).
Everything seemed ok until I tried to login.
I got a fatal error saying:
Fatal error: Class 'Concrete5_Controller_Block_DashboardFeaturedTheme' not found in /home/aikidoem/public_html/updates/concrete5.6.3.4/concrete/blocks/dashboard_featured_theme/controller.php on line 4

As my database was restored from a late backup, I tend to believe that I might have done something wrong by not copying all the files - older updates mainly. The "dashboard_featured_theme" folder seems to be the same in each update folder so I don't understand the message.
Many thanks in advance for taking your time to help me.
Sylvain P.

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