Thanks for your help.  Below is the code.


trigger createNextTask on Task (before update) {
    
   Map<Id,string> whatIds = new Map<Id,string>();
   Set<Id> ECIds = new Set<Id>();
   Set<Id> EPIds = new Set<Id>();
   Map<Id,string> whoIds = new Map<Id,string>();
   set<Id> EI2ContactIds = new Set<Id>();
   set<Id> EI2ProjectIds = new Set<Id>();
   List<Task> EI2tskList = new List<Task>();

   Task EI2tsk;
   private Id eidTaskRecordTypeId = Schema.SObjectType.Task.getRecordTypeInfosByName().get('EI2').getRecordTypeId();
 
   if(TriggerHandler.firstRun) {
  
     for(task t:trigger.new){
        if(t.RecordTypeId == eidTaskRecordTypeId){
          string whId = t.WhoId;           
          if(whId!= null && whId.startsWith('003')&& !EI2ContactIds.contains(t.WhoId)){
             EI2ContactIds.add(t.WhoId);
           }
          string whaId = t.WhatId;
          // cnte sandbox id for ISEIF and EI2 Projects is a1Z
            // if(whaId!= null && whaId.startsWith('a1Z')&& !EI2ProjectIds.contains(t.WhatId)){
          // production id for ISEIF and EI2 Projects is a0Y
             if(whaId!= null && whaId.startsWith('a0Y')&& !EI2ProjectIds.contains(t.WhatId)){
             EI2ProjectIds.add(t.WhatId);
           }
        }    
     }
    
      
     for(contact c :[select Id,EI2_Act_on_Status__c,ARES_Status__c,Real_Time_Status__c from contact where Id IN :EI2ContactIds  ]){
        if( ( c.EI2_Act_on_Status__c =='Interested'|| c.EI2_Act_on_Status__c == 'Referred')||(c.ARES_Status__c == 'Interested'||c.ARES_Status__c =='Referred')
           ||(c.Real_Time_Status__c == 'Interested'|| c.Real_Time_Status__c == 'Referred')){
               ECIds.add(c.id);
        }
     }     
     for(ISEIF_and_EI2_Projects__c p :[select Id, Project_Status__c, ARES_Status__c, EI2_Project_Status__c From ISEIF_and_EI2_Projects__c where Id IN :EI2ProjectIds ]) {
        if( p.EI2_Project_Status__c=='Active' || p.EI2_Project_Status__c =='On Hold' || p.EI2_Project_Status__c=='FO Hold' ||
            p.EI2_Project_Status__c=='Construction' || p.EI2_Project_Status__c=='Audit' ||
            p.EI2_Project_Status__c=='QAQC' || p.EI2_Project_Status__c=='House Party Scheduled' ||
            p.ARES_Status__c=='Active' || p.ARES_Status__c =='On Hold' || p.ARES_Status__c == 'FO Hold'||
            p.Project_Status__c=='Active'|| p.Project_Status__c=='On Hold' || p.Project_Status__c=='FO Hold' ){
               EPIds.add(p.id);
        }
     }
        
     for(task ta:trigger.New){
       
           string status = ta.TStatus__c;
           string priority = ta.TPriority__c;
           string program = ta.TProgram_Related_To__c;
           string subj = ta.TSubject__c;
                                   
           if( (ECIds.contains(ta.WhoId) || EPIds.contains(ta.WhatID)) && ta.Status == 'Completed'){
              if(status== null){
                ta.TStatus__c.adderror('The Contact or ISEIF and EI2 Project is still Open. Please Fill the Status field to create a new task');
              }
              if(priority == null){
                ta.TPriority__c.adderror('The Contact or ISEIF and EI2 Project  is still Open. Please Fill the Priority field to create a new task');
              }
              if(program == null){
                ta.TProgram_Related_To__c.adderror('The Contact or ISEIF and EI2 Project is still Open. Please Fill the Program Related To field to create a new task');
              }
              if(subj== null){
                ta.TSubject__c.adderror('The Contact or ISEIF and EI2 Project is still Open. Please Fill the Subject field to create a new task');
              }
             if(status!=null&&priority!=null&&program!=null&&subj!=null){
              EI2tsk = new Task(Subject = ta.TSubject__c,Priority = ta.TPriority__c,
                                  Program_Related_To__c = ta.TProgram_Related_To__c,
                                  ActivityDate = Date.Today(), OwnerId= ta.OwnerId,
                                  Status = ta.TStatus__c,
                                  WhoId = ta.WhoId, WhatId = ta.WhatId,
                                  Interaction_Result__c=ta.TInteraction_Result__c,
                                  Interaction_Source__c = ta.TInteraction_Source__c,
                                  Interaction_Type__c = ta.TInteraction_Type__c,
                                  Activity_data_time__c=ta.TCompleted_date_time__c,
                                  RecordTypeId=ta.RecordTypeId);
               EI2tskList.add(EI2tsk );                       
                  
              }
           }
      }
     
           
      if(EI2tskList.size()>0){
        database.insert(EI2tskList,false);
      }
      TriggerHandler.firstRun = false;
   }
}