Apex Basics & Database Unit 5/5

Hello, Community, I am facing problem in solving this challenge, please advise.

Here is the criteria presented: 

With SOSL you can search against different object types that may have similar data, such as contacts and leads. To pass this challenge, create an Apex class that returns both contacts and leads that have first or last name matching the incoming parameter.

The Apex class must be called 'ContactAndLeadSearch' and be in the public scope.
The Apex class must have a public static method called 'searchContactsAndLeads'.
Because SOSL indexes data for searching, you must create a Contact record and Lead record before checking this challenge. Both records must have the last name 'Smith'. The challenge uses these records for the SOSL search.
The return type for 'searchContactsAndLeads' must be 'List<List< SObject>>'
The 'searchContactsAndLeads' method must accept an incoming string as a parameter, find any contact or lead that matches the string as part of either the first or last name and then return those records.

Error received: 
Challenge not yet complete... here's what's wrong: 
Executing the 'searchContactsAndLeads' method failed. Either the method does not exist, is not static, or does not return the expected search results.

Here is my code:
public class ContactAndLeadSearch{
    public static List<List< SObject>> searchContactsAndLead(String name)
    {
        List<List<sObject>> result=[FIND :name IN ALL FIELDS RETURNING Lead(LastName),Contact(LastName)];
                return result;
    }
}

PLEASE ADVISE...Thanks Community!!!

I am working on a Trailhead Challenge and receive this error when I execute.



Create an Apex class that returns contacts based on incoming parameters.

For this challenge, you will need to create a class that has a method accepting two strings. The method searches for contacts that have a last name matching the first string and a mailing postal code (API name: MailingPostalCode) matching the second. It gets the ID and Name of those contacts and returns them.The Apex class must be called 'ContactSearch' and be in the public scope.
The Apex class must have a public static method called 'searchForContacts'.
The 'searchForContacts' method must accept two incoming strings as parameters, find any contact that has a last name matching the first, and mailing postal code matching the second string. The method should return a list of Contact records with at least the ID and Name fields.
The return type for 'searchForContacts' must be 'List<Contact>'.

Here's my code:



Can someone assist me? Please.

Thank you,
Darren