[Neos] Lelesys.Plugin.SlideShow crop Images

[Andrew Omelyanchuk]

I use Lelesys.Plugin.SlideShow for gallery. 
Code output images
<img alt="{alternativeText}" title="{title}" src="{f:uri.resource(resource: image.resource)}" width="280" height="195">	
i want to use 
<media:image image="{image}" alt="test" title="test" maximumWidth="280" maximumHeight="195" allowCropping="TRUE" />
but i have error
Cannot cast object of type "TYPO3\Media\Domain\Model\ImageVariant" to string. (201503191548493c5964)

How I can fix it?