Gutter not locating bank in terrain model - ORD Drainage

Placing nodes along a model for an initial longitudinal layout( first attempt at ORD drainage) and when i attempt to place a gutter between the nodes I'm occasionally getting an error coming up which is stating that the Gutter sections does not have a left or right bank in the terrain model.

The design model which was used to produce the design surface has a continuous SA kerb along the project through this area.

Below is the error message that i have been receiving

Is anyone able to shed more light on what could be causing this to occur randomly?

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