I have 2 batch Apex classes that update Account fields from different custom objects. I was running into issues of accessing records and found a way to run the batches in order. The test class for my 1st batch runs and covers my classes.  When I run the 2nd test class, I get the following error & Stack Trace:

   

System.StringException: Only CronTrigger IDs and batch, future, and queueable job IDs are supported.
    
    Class.AccountTotalReferralsBatch.finish: line 23, column 1

Can anyone help me resolve this error?

Batch Class:

   

public class AccountTotalReferralsBatch implements Database.Batchable<sObject> {
        public Database.QueryLocator start(Database.BatchableContext context) {
            return Database.getQueryLocator([SELECT Id FROM Account]);
        }
        public void execute(Database.batchableContext context, Account[] scope) {
            Map<Id, AggregateResult> results = new Map<Id, AggregateResult>([
                SELECT Account__c Id, COUNT(Id) amt
                FROM Referral__c
                WHERE Account__c = :scope AND Age__c<366 GROUP BY Account__c]);
                
            for(Account record: scope) {
                AggregateResult amount = results.get(record.Id);
                if(amount != null) {
                    record.Referrals__c = (Decimal)amount.get('amt');
                } else {
                    record.Referrals__c = null;
                }
            }
            update scope;
        }
        public void finish(Database.BatchableContext bc) {
            BatchSchedule__c b = BatchSchedule__c.getOrgDefaults();
                System.abortJob(b.Scheduled_Id__c);
        }         
    }

Scheduler Class:

   

global class AccountTotalReferralsSchedule implements Schedulable{
        global void execute(SchedulableContext sc){
            AccountTotalReferralsBatch ref = new AccountTotalReferralsBatch();
            database.executebatch(ref,200);
        }
    }

Test Class:

@istest (SeeAllData=FALSE)
    public class AccountTotalReferralsTest{
        
        public static testmethod void testBatch1() {
            Test.startTest();
            
            Account account = TestUtility.createAccount('Prospect', Constants.RECORDTYPEID_ACCOUNT_FAMILY);
            insert account;
            
            Contact contact = TestUtility.createContact(account.Id, Constants.RECORDTYPEID_CONTACT_FAMILY, 'Primary');
            insert contact;
            
            Encounters__c encounter = TestUtility.createEncounter(account.Id, contact.Id, '', '');
            insert encounter;
            
            BatchSchedule__c batchSchedEnc = new BatchSchedule__c();
            insert batchSchedEnc;
            
    AccountTotalReferralsBatch();
    
                string chron = '0 0 23 * * ?';
                string jobid = System.schedule('testScheduledApex', chron, new AccountTotalEncountersSchedule());
                CronTrigger ct = [Select id , CronExpression from CronTrigger where id = :jobId];
    
            Referral__c testRef = new Referral__c();
            testRef.Name = 'Test';
            testRef.Account__c = account.Id;
            insert testRef;
    
            batchSchedEnc = [SELECT Id,Scheduled_Id__c FROM BatchSchedule__c WHERE ID =: batchSchedEnc.Id];
                batchSchedEnc.Scheduled_Id__c = ct.Id;
            
            AccountTotalReferralsBatch testBatch = new AccountTotalReferralsBatch();
            
            Database.executebatch(testBatch);        
            Test.stopTest();
        }
    }