Your attachment won't open so I can only guess as to the problem. To subpatch splines you need to have 3 or four splines, each sharing a common point with another that it crosses. Select the splines in clock-wise or counter-clockwise order and is everything is correct they will patch. If you still get the error and you are positive you are working with only 3 or 4 splines that intersect, double check that they are sharing a point. If not, weld them together.
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