Problems with new DimensionsMenu in Neos 2.3

Using Neos & Flow
1

If I use the new DimensionsMenu get following error:

Exception #1237823695 in line 614 of /docker/www/Neos/Data/Temporary/Development/Cache/Code/Flow_Object_Classes/TYPO3_Fluid_Core_Parser_TemplateParser.php: Argument "item" was not registered.