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  1. Check wether the requested class really implements TYPO3\\CMS\\Backend\\Toolbar\\ToolbarItemHookInterface

Exception on shortcut

  1. The error might have been caused because the argument to the constructor was not passed by reference as requested by the Interface/Class. In general this causes just a warning but can also lead to serious problems.
  2. There's a bug in PHP 5.5.6+ which causes this Exception:

I moved Typo3 6.1.6 from a server with php 5.3.15 to one with 5.6.1. It is the same code nothing changed in DB or code. Now I get this error whenever I want to open backend.

  1. 1195126772: $toolbarItem "shortcuts" must implement interface TYPO3\CMS\Backend\Toolbar\ToolbarItemHookInterface (More information)

UnexpectedValueException thrown in file /_www/ in line 148.

Here is the code:

        * Initializes the core toolbar items
        * @return void
       protected function initializeCoreToolbarItems() {
               $coreToolbarItems = array(
                       'shortcuts' => 'TYPO3\\CMS\\Backend\\Toolbar\\ShortcutToolbarItem',
                       'clearCacheActions' => 'TYPO3\\CMS\\Backend\\Toolbar\\ClearCacheToolbarItem',
                       'liveSearch' => '\\TYPO3\\CMS\\Backend\\Toolbar\\LiveSearchToolbarItem'
               foreach ($coreToolbarItems as $toolbarItemName => $toolbarItemClassName) {
                       $toolbarItem = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($toolbarItemClassName, $this);
                       if (!$toolbarItem instanceof \TYPO3\CMS\Backend\Toolbar\ToolbarItemHookInterface) {
                               'throw new \UnexpectedValueException('$toolbarItem "' . $toolbarItemName . '" must implement interface TYPO3\\CMS\\Backend\''''Bold text
                       if ($toolbarItem->checkAccess()) {
                               $this->toolbarItems[$toolbarItemName] = $toolbarItem;
                       } else {


My Backend worked well again after switching to PHP 5.5 -> Don't use PHP 5.6 until fixed.