Error Implementing Database.batchable

I'm getting the following error in my batchable class. I want to pull all training records with an expiration date older than today and then ultimately mass update their Training Status to expired. I plan on making it schedulable.

I'm getting the following error:

BatchUpdateTraining: Class must implement the global interface method: Iterable<Training__c> start(Database.BatchableContext) from Database.Batchable<Training__c>

Apex:

global class BatchUpdateTraining implements Database.Batchable<Training__c>{
    public String Query;

    public Database.QueryLocator start(Database.BatchableContext BC) 
    {   
        Query = 'SELECT id,Training_Status__c,Expiry_Date__c FROM Training__c WHERE Expiry_Date__c > Today';
        return Database.getQueryLocator(Query);
    }

    public void execute(Database.BatchableContext BC, List<Training__c> scope) 
    {   
        for (Training__c ac : scope) 
        {
        
        }
        update scope;
    }

    public void finish(Database.BatchableContext BC) { }    
}

June 10, 2015
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Best Answer chosen by Tyler Harris

sfdc Beginner
Hi Tyler,

Update your Code Like this, it will work.

global class BatchUpdateTraining implements Database.Batchable<sobject>{

     public String Query;

     public Database.QueryLocator start(Database.BatchableContext BC) {

        Query = 'SELECT id,Training_Status__c,Expiry_Date__c FROM Training__c WHERE Expiry_Date__c > Today';

        return Database.getQueryLocator(Query);

    }

     public void execute(Database.BatchableContext BC, List<Training__c> scope) {

        for (Training__c ac : scope) {



       }

           update scope;

     }

    public void finish(Database.BatchableContext BC) { }

   }

If this solves your Problem, Mark it as the Best Answer.

Thanks,
SFDC Beginner