Sketchup volume calculation.

I have this model of my midbass enclosure in Sketchup but it won't give me volume. As a matter of fact it won't even close up the sides, maybe something about the odd shape but none of these surfaces are curved just different angles. There is one side it closed by as you can see I made an X in the other side and it didn't close it up.

Solid Inspector has errors but they dont' make any sense to me. I even erased half of the walls and redrew them, then deleted the others ones and redrew them with no difference made. I don't want to go down the math rabbit hole on this one!

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