If you receive the error "More than one Rocket Racing Track has the Track Type value set to \"Primary\". There must be exactly one Primary Track", this means that you have too many Rocket Racing Track devices that are set to Primary.
To resolve this, update your Rocket Racing Track devices so that only one has Track Type set to “Primary”. Your primary track is the one whose spline component should extend from your start line to your finish line, unbroken.