'Not a solid' error when trying to subtract one group from another?

I’m trying to subtract these long cylinders from this vase thingy, and it works just fine for the first two ones but then when I try it again it says ‘not a solid’ when I click the vase like I’m supposed to (picture follows). Does anyone know how to fix this? Help is much appreciated!!

So apparently the second subtraction is making the vase a non-solid. How big is it? Maybe you need to scale everything up first.

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Yeah I scaled it up by 2 but then it did the same thing, but now I scaled it up by a thousand and that seems to do the trick. Thanks!

Generally scaling up by 2 won’t be useful. For small models like that I generally work in meters instead of inches or millimeters.