The rate start date can't be determined. Check the rate start date config for this plan or program

Hi Team,

When we evaluate the life event loss of eligibility for dependents cross age 26, we get the below error. Any idea?

The rate start date can't be determined. Check the rate start date configuration for this plan or program. (BEN-990151)

If the plan design allows for an enterable rate start date, ensure that a date is entered. There might also be a configuration error whereby the rate start date rule and the rate end date rule are mismatched, and provide either a gap or an overlap. It's also possible that a rate start date formula requires revision. Context at the time of error: Person ****, Program **** Plan Medical, Option Employee + Family.