global class OpportunityStatusReport implements Schedulable {
 
    public static final String EMAIL_TEMPLATE_ID = '00XP0000000HucQ';
    public List<AggregateResult> openOpps = new List<AggregateResult>();
    public Messaging.SingleEmailMessage [] singleEmails = new List<Messaging.SingleEmailMessage>();
    public Messaging.Email[] allEmails = new List<Messaging.Email>();
    
  
    global void execute (SchedulableContext SC)
    {
        // Gets the list of the opportunity status report recipients. Only active users with open opportunities will get an email.
        openOpps = 
        [
            SELECT o.OwnerId 
            FROM Opportunity o
            WHERE o.Owner.isActive = true
            AND o.isClosed = false
            GROUP BY o.OwnerId
        ];
        
        if(openOpps.size() > 0)
        {
            // Creates a personalized email for each recipient
            for (AggregateResult opp : openOpps)
            {
                Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
                mail.setTargetObjectId((String)opp.get('OwnerId'));
                mail.setTemplateId(EMAIL_TEMPLATE_ID);
                mail.setSaveAsActivity(false);
                singleEmails.add(mail);
            }
            
            for( Integer i = 0; i < singleEmails.size(); i++ )
            {
                allEmails.add(singleEmails.get(i));
            }
            
            if (allEmails.size() > 0)
            {
                Messaging.sendEmail( allEmails );
            }
        }
    }
}

System.UnexpectedException: Not Serializable: LIST<Messaging.Email>

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Hey guys,

how can I fix the exception? (Making the list transient doesn't solve the problem)

Thx for your help

Josh