Help Needed - Sketchup wont substract

Hi,

Can someone please help, I'm remodeling an item, I build the item for the most parts, I need to make 6 holes to an object, the object was turned to a component, as well as each of the cylinders that need to be subtracted from the object, while 3 of the cylinders were subtracted without any problems 3 wont get subtracted.
Attached is the file which is almost self-explanatory

Thank you

The object you are trying to subtract from is not a solid (manifold) object, ergo it can not perform the subtraction.
Make the object solid.

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Bob Morrison
Wörth am Rhein, Germany
"Luke, use the source!"
BLOG - PHOTOS - Thingiverse

The main block was a solid, but once the first hole was subtracted, the main block became a non-solid and the rest would fail to subtract. The use of the Solid Inspector and Clean-up3 plugins shows where occurring.

Check out my vid on creating nuts and bolts to see the plugins in action...[m.youtube.com]