Cura shows hole in printer during "preview/slice"

[TomoCreations 0]

Ello, im a bit new still to printing but i have a issue. When I preview the cut in cura it shows these "holes or gaps" in my print but it looks perfectly fine when in the non preview mode.
I have printed with cura before with a different model in the same shape and didn't get these gaps on my print. what do I do about this. is it my model? 

The gray areas are the gaps 

I use a ender 5 plus.

Edited September 11 by TomoCreations

[Carla_Birch 77]

That's likely due to the walls of the model being to thin to do a single extrusion width at them points.

If you turn on "Print thin walls" from under the "Shell" settings it might help, you can also try a smaller nozzle size. Other then that, it would need the model to be made thicker walled.