Error

public class EmploymentHistoryTriggerHelper {
    public void contactEmploymentHistory(List<Employment_History__c> newRecords, map<Id,Employment_History__c>oldMap){
        system.debug('newRecords'+newRecords);
        system.debug('oldMap'+oldMap);

        Set<Id> contactIdSet = new Set<Id>();

        for(Employment_History__c tempRecords : newRecords ){
            contactIdSet.add(tempRecords.Contact_Name__c);
            system.debug('tempRecords :' + tempRecords);
            system.debug('contactIdSet :' + contactIdSet);

        }
        system.debug('emplIdSet :' + contactIdSet);
        List<Employment_History__c> idEmpl = [ SELECT Id,Company_Name__c,Contact_Name__c,End_Date__c,start_Date__c,
                                               RecordTypeId, RecordType.name FROM Employment_History__c
                                               WHERE Contact_Name__c =: contactIdSet];
        system.debug('idEmpl :' + idEmpl);

        map<Id,list<Employment_History__c>> mapEmplList = new  map<Id,list<Employment_History__c>> ();
        system.debug('mapEmplList :' + mapEmplList);

        for( Employment_History__c temp : idEmpl){
            if(mapEmplList.containsKey(temp.Contact_Name__c)){
            mapEmplList.get(temp.Contact_Name__c).add(temp);
            system.debug('temp :'+ temp);
            }
            else{
                List<Employment_History__c> listEmpNew = new List<Employment_History__c>();
                listEmpNew.add(temp);
                mapEmplList.put(temp.Contact_Name__c,listEmpNew);
                system.debug('listEmpNew :'+ listEmpNew);
                system.debug('temp :'+temp);
            }
        system.debug('temp :'+temp);
        }
        system.debug('mapEmplList :' + mapEmplList);
       /* list<RecordType> gruopRecordType= [SELECT Id, name, SObjectType FROM RecordType
                                           WHERE SObjectType = 'Employment_History__c' ORDER BY Id ];
        system.debug('Record Types gruopRecordType :' + gruopRecordType.size());
        Map<String,Schema.RecordTypeInfo> rtMapEmplByName = Schema.SObjectType.Employment_History__c.getRecordTypeInfosByName();
        id recordTypeName = rtMapEmplByName.get('Old Employer').getRecordTypeId();
        system.debug('rtMapEmplByName :'+rtMapEmplByName); */
        for(Employment_History__c tempEmp : newRecords){
            //generar if para "tempEmp.record Type == ('Current crEmployer')|| tempEmp.record Type == ('Old Employer'"
            if( tempEmp.recordType.Name == 'Old Employer'){

                if(mapEmplList.containsKey(tempEmp.Contact_Name__c)){
                    /*sacar la lista de mi map que esta almacenado mapEmplList
                     esta no se debe realizar ya que , solo puedo ingresar 100
                    List<Employment_History__c> historyEmp = [SELECT Id, Cargo__c,Company_Name__c,Contact_Name__c,
                    system.debug('historyEmp :' + historyEmp);  */
                    for (Employment_History__c oldD : mapEmplList.get(tempEmp.Contact_Name__c)){// recorrer la lista historyEmp
                            if(tempEmp.start_Date__c < oldD.End_Date__c && tempEmp.End_Date__c > oldD.start_Date__c ){
                                tempEmp.addError('debe digitar una fecha que se encuentre dentro de un rango posible');
                                system.debug('mapEmplList :' + mapEmplList);
                                system.debug('newRecords :' + newRecords);
                                system.debug('oldD.End_Date__c :'+oldD.End_Date__c);
                                system.debug('oldD.start_Date__c :'+oldD.start_Date__c);
                                system.debug('tempEmp.start_Date__c :'+tempEmp.start_Date__c);
                                system.debug('tempEmp.start_Date__c :'+tempEmp.End_Date__c);
                            }
                            system.debug('oldD :'+oldD);
                        }
                    system.debug('tempEmp :'+tempEmp);
                    }
                }

            else if(tempEmp.RecordType.Name =='Current Employer' ){
                //if(Employment_History__c.getRecordTypeId('Current Employer')){
                    system.debug('tempEmp.Id :'+tempEmp.name);
                if(mapEmplList.containsKey(tempEmp.Contact_Name__c)){
                    for(Employment_History__c currentD : mapEmplList.get(tempEmp.Contact_Name__c)){
                            system.debug('mapEmplList :' + mapEmplList);
                        if(tempEmp.start_Date__c >= currentD.End_Date__c  ){
                                tempEmp.addError('debe digitar una fecha que se encuentre dentro de un rango posible');

                        }
                    }
                }
            }

        }
    }
}