Applying a Fixed Geometry Error

Hello,

I am trying to apply a fixed geometry to my assembly  where the bolt would go, and I keep getting this error.  A little bit of information about the assembly, the two rails are weldments, and the middle plate is a sheetmetal piece.  I have the "Treat as a solid" selected on every item I can, and yet when I try to add this fixture to the cylindrical face of the bolt hole, I cannot.  Anyone have any ideas?

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