Warning - This structure is disjointed - Staad Pro Connect

Hello,

I am seeking help with connecting my base plates to my structure frame. I receive the warning " Warning - This structure is disjointed " and I believe it is because my plate and structure are not connected properly. How do I do so?  I have been having issues with learning the connectivity of members. The file is attached below.  

Underground Rescue Shelter - Option C R2 - per 1m area supports.STD

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