If you have
Retained design points (cached solution data), and
A connection from a Blade Design cell (BladeGen) or Geometry cell (BladeEditor) to a Turbo Mesh cell (TurboGrid)
and you then make a non-parametric change to design point 0, then the next time you update a design point other than design point 0, you will see error messages that include the words "The path is not of a legal form". You can safely ignore such error messages.