Issue with displaying Slides

Hej there,

I am using owl carousel for a client website running on wordpress 4.1.1.

If I use the the shortcode given by the text editor everything works fine.

Shortcode by text editor:

[owl-carousel category="authors" singleItem="true" autoPlay="true"]

If i change the parameters singleItem to items=”5″ no slide will be shown.

Code after change:

[owl-carousel category="authors" singleItem="false" items="5" autoPlay="true"]

or

[owl-carousel category="authors" items="5" autoPlay="true"]

are not working.

Do you have an idea?

https://www.ads-software.com/plugins/owl-carousel/