I have a scheduled flow to run daily : 

1. A get element that will take all my contacts under specific criteria : 
2. I loop through all the contacts found: 


3. I assign the IDs of the loop into a variable.

4. I have an APEX class to send an email and the last action is to send the email to the contacts. 
public class SendIMRMonthlyEmails {
    
    @InvocableMethod
    public static void invokeapex(list<Project_Contacts__c>ProjectContacts){
        List<Id> contactIds = new List<Id>();
        List<Messaging.SingleEmailMessage> emailList = new List<Messaging.SingleEmailMessage>();
        EmailTemplate et=[Select id from EmailTemplate where name = :System.Label.Sent_IMR_Monthly_Email_Project_Contacts limit 1];
        
        for(Project_Contacts__c obj : ProjectContacts){
            if(obj.Project_Deliverables__c=TRUE){
                contactIds.add(obj.Id);
                Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
                mail.setTargetObjectId(obj.Project_Contact__c);
                mail.setSenderDisplayName('IMR Monthly Emails');
                mail.setTemplateId(et.id);
                mail.setSaveAsActivity(FALSE);
                mail.setWhatId(obj.Id);
                mail.setBccAddresses(new List<String> {System.Label.Sent_IMR_Monthly_Email_BCC_Email});
                emailList.add(mail);      
        }   
    }
        Messaging.sendEmail(emailList);
    }  
}


Still, when I ran the flow I receive an error: "
An Apex error occurred: System.LimitException: Too many Email Invocations: 11" which leads me to the idea that I did something wrong to the flow or to the apex class.