Here are the stack traces:

NullReferenceException: Object reference not set to an instance of an object.
  at UnityEngine.Bindings.ThrowHelper.ThrowNullReferenceException (System.Object obj) [0x00000] in <00000000000000000000000000000000>:0
  at UnityEngine.Transform.get_localPosition () [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.CurvySplineSegment.get_HasUnprocessedLocalPosition () [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.CurvySpline.DoUpdate () [0x00000] in <00000000000000000000000000000000>:0

IndexOutOfRangeException: Index was outside the bounds of the array.
  at FluffyUnderware.Curvy.CurvySplineSegment.GetOrientationUpFast (System.Single localF, UnityEngine.Space space) [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.Generator.SplineInputModuleBase.GetSplineData (FluffyUnderware.Curvy.CurvySpline spline, System.Boolean fullPath, FluffyUnderware.Curvy.Generator.CGDataRequestRasterization raster, FluffyUnderware.Curvy.Generator.CGDataRequestMetaCGOptions options) [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.Generator.Modules.InputSplinePath.OnSlotDataRequest (FluffyUnderware.Curvy.Generator.CGModuleInputSlot requestedBy, FluffyUnderware.Curvy.Generator.CGModuleOutputSlot requestedSlot, FluffyUnderware.Curvy.Generator.CGDataRequestParameter[] requests) [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.Generator.CGModuleInputSlot.GetData[T] (System.Int32 slotIndex, System.Boolean& isDataDisposable, FluffyUnderware.Curvy.Generator.CGDataRequestParameter[] requests) [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.Generator.CGModuleInputSlot.GetData[T] (System.Boolean& isDataDisposable, FluffyUnderware.Curvy.Generator.CGDataRequestParameter[] requests) [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.Generator.Modules.BuildShapeExtrusion.Refresh () [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.Generator.CGModule.doRefresh () [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.Generator.CurvyGenerator.Refresh (System.Boolean forceUpdate) [0x00000] in <00000000000000000000000000000000>:0
  at FluffyUnderware.Curvy.Generator.CurvyGenerator.Initialize (System.Boolean force) [0x00000] in <00000000000000000000000000000000>:0