The challenge is 

The Apex class must be called ContactAndLeadSearch and be in the public scope
The Apex class must have a public static method called searchContactsAndLeads
The method must accept an incoming string as a parameter
The method should then find any contact or lead that matches the string as part of either the first or last name
The method should finally use a return type of List<List< SObject>>
NOTE: 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

I have written the followig code for ContactAndLeadSearch class

public class ContactAndLeadSearch {
    public static List<List<SObject>> searchContacctsAndLeads(String searchword) {
        List<List<SObject>> searchLead = [Find :searchword IN ALL FIELDS RETURNING
                                         Lead(LastName), Contact(LastName)];
        return searchLead;
    }

}

I have alos created contacts in lead and contacts with last name Smith.
But when checking the challenge I get the error "Executing the 'searchContactsAndLeads' method failed. Either the method does not exist, is not static, or does not return the expected search results."

The log file generated is

30.0 APEX_CODE,FINEST;APEX_PROFILING,INFO;CALLOUT,FINEST;DB,FINEST;NBA,INFO;SYSTEM,DEBUG;VALIDATION,INFO;VISUALFORCE,INFO;WAVE,INFO;WORKFLOW,INFO
Execute Anonymous: List<Contact> contacts = [SELECT ID from Contact WHERE LastName = 'Smith']; List<Lead> leads = [SELECT ID from Lead where LastName='Smith']; System.assertNotEquals(contacts.size(),0); System.assertNotEquals(leads.size(),0);
01:21:51.2 (2142431)|USER_INFO|[EXTERNAL]|0052v00000bvR7u|mandapaticharan@brave-panda-rpsvz.com|Pacific Standard Time|GMT-07:00
01:21:51.2 (2170579)|EXECUTION_STARTED
01:21:51.2 (2176878)|CODE_UNIT_STARTED|[EXTERNAL]|execute_anonymous_apex
01:21:51.2 (2401411)|VARIABLE_SCOPE_BEGIN|[1]|contacts|List<Contact>|true|false
01:21:51.2 (2463659)|VARIABLE_SCOPE_BEGIN|[1]|leads|List<Lead>|true|false
01:21:51.2 (2582941)|HEAP_ALLOCATE|[79]|Bytes:3
01:21:51.2 (2613502)|HEAP_ALLOCATE|[84]|Bytes:152
01:21:51.2 (2628506)|HEAP_ALLOCATE|[399]|Bytes:408
01:21:51.2 (2642831)|HEAP_ALLOCATE|[412]|Bytes:408
01:21:51.2 (2655370)|HEAP_ALLOCATE|[520]|Bytes:48
01:21:51.2 (2680056)|HEAP_ALLOCATE|[139]|Bytes:6
01:21:51.2 (2710360)|HEAP_ALLOCATE|[EXTERNAL]|Bytes:1
01:21:51.2 (2843783)|STATEMENT_EXECUTE|[1]
01:21:51.2 (2848696)|STATEMENT_EXECUTE|[1]
01:21:51.2 (2859120)|HEAP_ALLOCATE|[1]|Bytes:47
01:21:51.2 (2882649)|HEAP_ALLOCATE|[1]|Bytes:4
01:21:51.2 (2919050)|HEAP_ALLOCATE|[52]|Bytes:5
01:21:51.2 (2943444)|HEAP_ALLOCATE|[58]|Bytes:5
01:21:51.2 (2958073)|HEAP_ALLOCATE|[66]|Bytes:7
01:21:51.2 (3207639)|SOQL_EXECUTE_BEGIN|[1]|Aggregations:0|SELECT ID FROM Contact WHERE LastName = 'Smith'
01:21:51.2 (9582402)|SOQL_EXECUTE_END|[1]|Rows:1
01:21:51.2 (9620070)|HEAP_ALLOCATE|[1]|Bytes:8
01:21:51.2 (9636190)|HEAP_ALLOCATE|[1]|Bytes:29
01:21:51.2 (9671720)|HEAP_ALLOCATE|[1]|Bytes:8
01:21:51.2 (9740848)|VARIABLE_ASSIGNMENT|[1]|contacts|[{"Id":"0032v00002z0iEOAAY"}]|0x3503b13c
01:21:51.2 (9752499)|STATEMENT_EXECUTE|[1]
01:21:51.2 (9757295)|HEAP_ALLOCATE|[1]|Bytes:44
01:21:51.2 (9774642)|HEAP_ALLOCATE|[1]|Bytes:4
01:21:51.2 (10056582)|SOQL_EXECUTE_BEGIN|[1]|Aggregations:0|SELECT ID FROM Lead WHERE LastName = 'Smith'
01:21:51.2 (16181160)|SOQL_EXECUTE_END|[1]|Rows:2
01:21:51.2 (16239134)|HEAP_ALLOCATE|[1]|Bytes:12
01:21:51.2 (16266868)|HEAP_ALLOCATE|[1]|Bytes:58
01:21:51.2 (16326773)|HEAP_ALLOCATE|[1]|Bytes:12
01:21:51.2 (16383323)|VARIABLE_ASSIGNMENT|[1]|leads|[{"Id":"00Q2v00001WRJc3EAH"},{"Id":"00Q2v00001XrjPTEAZ"}]|0x71bff914
01:21:51.2 (16395197)|STATEMENT_EXECUTE|[1]
01:21:51.2 (16507556)|STATEMENT_EXECUTE|[1]
01:21:51.16 (16585324)|CUMULATIVE_LIMIT_USAGE
01:21:51.16 (16585324)|LIMIT_USAGE_FOR_NS|(default)|
  Number of SOQL queries: 2 out of 100
  Number of query rows: 3 out of 50000
  Number of SOSL queries: 0 out of 20
  Number of DML statements: 0 out of 150
  Number of DML rows: 0 out of 10000
  Maximum CPU time: 0 out of 10000
  Maximum heap size: 0 out of 6000000
  Number of callouts: 0 out of 100
  Number of Email Invocations: 0 out of 10
  Number of future calls: 0 out of 50
  Number of queueable jobs added to the queue: 0 out of 50
  Number of Mobile Apex push calls: 0 out of 10

01:21:51.16 (16585324)|CUMULATIVE_LIMIT_USAGE_END

01:21:51.2 (16622364)|CODE_UNIT_FINISHED|execute_anonymous_apex
01:21:51.2 (18459022)|EXECUTION_FINISHED

Can some one tell me where I am doing it wrong?

While working on App Customization Specialist superbadge at seccond challenge I always get this error 
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: HRZCQEPD
Close errors
I have created and used a new playground for this superbadge first time and second time i used an org but still get the same error

Hi,

I am trying to complete the App Customization Specialist super badge step 2. I am getting The 'Shift Hours' field on the 'Volunteer Shift Workers' object is not configured correctly error even though I have put the correct formula.

I have tried (floor(( Shift_End_Time__c - Shift_Start_Time__c )*24)) and FLOOR(( Shift_End_Time__c - Shift_Start_Time__c ) * 24 ). Still unable to get past the error and I have already spent couple of days trying to debug the issue.  

Please let me know any solutions. Thanks in advance.