Error "UIExtension 0" after Plugin install

Hello guys,

i am experiencing a strange error in my wiki after accidentally installing a extension which needs a license… after deinstallation the error still remains…

I am on xwiki 16.2 on Debian with a MariaDB.

Error Code in the notification plugin or when i try to install/deinstall a plugin with the extension manager:

UIExtension 0
Executed Content
{{velocity}}
  #if ("$!xcontext.userReference" != '' && $services.notification.isEnabled())
    #set ($discard = $xwiki.jsx.use('XWiki.Notifications.Code.Macro.NotificationsMacro'))
    #set ($discard = $xwiki.jsx.use('XWiki.Notifications.Code.NotificationsDisplayerUIX'))
    #set ($discard = $xwiki.ssx.use('XWiki.Notifications.Code.Macro.NotificationsMacro'))
    #set ($discard = $xwiki.ssx.use('XWiki.Notifications.Code.NotificationsDisplayerUIX'))
    ## TODO: replace by $xwiki.sswx.use() or something like this when XWIKI-12788 is closed.
    #set ($discard = $xwiki.linkx.use($services.webjars.url('bootstrap-switch', 'css/bootstrap3/bootstrap-switch.min.css'), {'type': 'text/css', 'rel': 'stylesheet'}))
    {{html clean="false"}} ## We need the clean false to avoid getting a supplementary ul element.
    <li class="notification-uix loading"></li>
    {{/html}}
  #end
{{/velocity}}

does anyone have an idea?
Thanks

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