In most cases, an exercise is started that was not created for this distance or an exercise has been set up incorrectly. Start a pre-programmed standard exercise and check whether the error appears again.
Create a new exercise with the faulty one as a template. In the newly created exercise, check that the distance matches the distance configured in the Range Configurator and that all fields have a valid value (e.g. target, score etc.).
If the error code 4003 appears with a configured system, check