This means that your tri-map is not complete. When creating your tri-map be sure that you have used all three colors: Red to cut, Green to Keep and Blue to compute. Also, make sure that there are no gaps in your blue outline. Anything outlined in blue should be closed off from your red and green selection. So for example, if you are outlining a soccer ball be sure that the circle around the ball is closed off.

Completed tri-map: 

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