The error message displayed when the user enters an invalid format for the addInsurance command is:
... Parameters: INDEX (must be a positive integer) , INSURANCE_PLAN_ID (must be a valid ID) ...
There is a missing prefix iid/ before INSURANCE_PLAN_ID, which is shown in the example command.

The error message displayed when the user enters an invalid format for the
addInsurancecommand is:... Parameters: INDEX (must be a positive integer) , INSURANCE_PLAN_ID (must be a valid ID) ...There is a missing prefix
iid/beforeINSURANCE_PLAN_ID, which is shown in the example command.