When we create a 2 Field on the custom setting 1st field carries the value of the user record 2nd field carries the profile id when we enter the id of a specific profile and save the record then the 1st field value should populate on all user records under that profile. Can some one help me out with the code ?

Challenge Not yet complete... here's what's wrong: 
The getBoats() method isn't working properly. Define getBoats() In the BoatSearchResults Apex controller to accept an optional boatTypeId and return all boats if no boatTypeId is passed, and a filtered list of boats if a boatTypeId is passed.

getting this error