The EngineBlock.FCStd example file contained a corrupt Points file. A new file was created by opening the V0.17 version of the FCStd file, saving that file, and then copying that Points file into the V0.22 FCStd file. It's a very OLD example BTW. See also #14583. To check the problem recompute the original V0.22 FCStd file. Result: ``` pyException: Traceback (most recent call last): File "D:\BKG_Tmp\FreeCAD_0.22\Mod\Draft\draftobjects\bspline.py", line 113, in execute spline.interpolate(obj.Points, PeriodicFlag = True, Parameters = self.knotSeq) <class 'Part.OCCError'>: Standard_ConstructionError 20:56:32 BSpline001: Standard_ConstructionError
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