ZERO STIFFNESS PROBLEM

Good Morning everyone,

I need your help in this model. I modeled a simple concrete frame which acts as  a support for a conveyor housing. 

But there is a warning showing that I have there is a zero stiffness problem.

Need your help in this matter . Thank you very much.

File is attached below.

https://communities.bentley.com/cfs-file/__key/communityserver-discussions-components-files/5932/CONVEYOR-_2300_8.std

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