SOLVED Loft cut error message ?????

[dwc]

What does this error message mean?
INCONS_EDGE_FACE_REL: Boolean could not determine the relationship between an edge of one body and a face of other body (ext)

I am doing a loft with 10 sketches. That works.
I then make 10 new sketches by projecting those 10 sketches to new sketches and do a loft cut at a different height so I have a curved wall (this will eventually be changed so the thickness is not uniform, for the time being is is uniform).
The second projected sketch causes this error, if I remove it all is well.
I see nothing untoward in the sketch, it seems to be exactly like the one it is projected from (as I would hope), and works fine in the loft boss.
Is there something else happening in loft cut?
For the moment I am at a loss, thanks in advance for any ideas.
Don

 

[simonb65]

Can you post a screen grab Don, that would help to visualise your issue.

 

[DavidJ]

Could you have got any of the sketches out of order in the loft?

I'm struggling to visualise how the projected sketches differ from originals - so as not to cut away the entire boss. I must be mis-understanding your words.

 

[dwc]

Here a picture. The loft cut is 3.2mm below the boss so 3.2mm material remains.

 

[dwc]

Aha... When I suppress everything but the loft boss and the loft cut from the part it works.
So it has something to do with the thicker part around the edge.
Maybe I can get it to work by changing the order of the features.

 

[dwc]

!! FOUND IT !! all Ok
The sketch was on the wrong plane
What is the easiest way to see on which plane a sketch is?
I haven't found anything good.