Generative Components

I am trying to place a co-ordinate system along a bspline curve. I need to use "by incremental distance along curve" as the spacing varies and I need to use "chord length"  for my purposes. I am finding that if I use the "chord length" option I get an error saying the "curve must be planar", but if I use "by spacing along a curve" using "chord length" it works? this also occurs with points? these errors do not occur if I use the "arc length" option.

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