[Neos] $ ./flow site:import -> error

[Maxi milian]

I want to import a local export from TYPO3 Neos 1.1 to an other 1.1 system:
$ ./flow site:export --tidy --filename export

Import:
$ ./flow site:import --package-key My.NeosPackage --filename export

It works with the text content until the first image in the export file I got following error:
"Error: During the import of the file "export" an exception occurred: Could not add object of type "TYPO3\Media\Domain\Model\Image"

How could I fix this?