The message says that your auxiliary bend node is within "x" degrees of the bend far node point. When nodes are really close together you run the risk of numerical accuracy problems. This is why we check for things of this nature.

Before you alter your model, you can try to change the configuration, to reduce the minimum allowed node spacing on bends. This directive (Minimum Angle to Adjacent Bend) can be found on the "Geometry" tab of the configuration module. Read the "help text" on this item also.