Test Class code coverage error: System.QueryException: List has no rows for assignment to SObject

Having some issues with my test class code coverage. It's at 90% coverage but will not allow me to deploy to production because of this error:

"System.QueryException: List has no rows for assignment to SObject"

Stack Trace:

"Class.deleteRowsDevNotes.onloadmethod: line 16, column 1 Class.deleteRowsDevNotesTest3.start: line 50, column 1"

Can anybody assist by pointing out what needs to be added to my "start" method?

Class:

    public class deleteRowsDevNotes {
//Variable to hold all accounts added/edited
public List<Sales_Dev_Notes__c> allContactList = new List<Sales_Dev_Notes__c>();

//Variable to hold add contacts to be deleted
public List<Sales_Dev_Notes__c> deleteContactList = new List<Sales_Dev_Notes__c>();

//Variable to hold the Contact record
public User accountRec {get;set;}

//Called when the page loads initially from the "action" method on the apex:page. Populates the Account record and the releated contact list
    public void onloadmethod() {

     List<Sales_Dev_Notes__c> allContactList1 = new List<Sales_Dev_Notes__c>();
     String aid =System.currentPageReference().getParameters().get('id');
     accountRec = [SELECT Id,Name,Profile.Name,Title,ManagerId,Extension,Current_Month_Quota__c,UserRole.Name FROM User WHERE Id=:aid]; 
     allContactList = [SELECT Id, OwnerId, CreatedById, CreatedDate, Notes__c, Coach_Type__c, Creator__c, Note_Date__c, Action__c FROM Sales_Dev_Notes__c WHERE OwnerId=:accountRec.Id ORDER BY Note_Date__c DESC];
}
//Send the list of contacts to the visualforce page
public List<Sales_Dev_Notes__c> getContacts(){
    return allContactList;
}

//Add a temporary contact to the table. Not saved to the database
public void addContact(){
    Sales_Dev_Notes__c c = new Sales_Dev_Notes__c();
    allContactList.add(c);
}

//Remove a contact from the table.
public void removeContact(){
    Integer indexVal = Integer.valueof(system.currentpagereference().getparameters().get('index'));
    //If the contact is an existing contact then add it to the list to delete from the databse
    if(allContactList[indexVal - 1].Id != null)
        deleteContactList.add(allContactList[indexVal - 1]);
    //Remove the contact from the table    
    allContactList.remove(indexVal - 1);            
}    
public void saveChanges(){
    //update existing contacts and insert new ones
    upsert allContactList;
    //delete the contacts that were removed
    if(deleteContactList.size() > 0)
        delete deleteContactList;
}    

}

AND Test Class:

    @isTest
private class deleteRowsDevNotesTest3 {

    static testMethod void myUnitTest() {
        deleteRowsDevNotes  clsObj = new deleteRowsDevNotes();
        /*Sales_Dev_Notes__c acct =  new Sales_Dev_Notes__c();
        acct.Name = 'testAccount';*/

        Apexpages.currentpage().getParameters().put('index','1');

       clsObj.addContact();


        clsObj.saveChanges();  
        clsObj.removeContact();  
    }

     static testmethod void start()
   {

   User accountRec1 = New User();
   accountRec1.LastName =  'Test';
   accountRec1.Alias = 'aTest';
   accountRec1.Email = '[email protected]';
   accountRec1.Username = '[email protected]';
   accountRec1.CommunityNickname = 'aTest';
   accountRec1.EmailEncodingKey = 'UTF-8';
   accountRec1.LanguageLocaleKey = 'en_US';
   accountRec1.LocaleSidKey = 'en_US';
   accountRec1.TimeZoneSidKey='America/Los_Angeles';
   accountRec1.ProfileId = '00e50000001Be3P';
   accountRec1.IsActive = true;
   Insert accountRec1 ; 

   system.runas(accountRec1) {
   date runtime=system.today();
   Sales_Dev_Notes__c allContactList1 = New Sales_Dev_Notes__c();
   allContactList1.Notes__c =  'Test';
   allContactList1.Coach_Type__c = 'aTest';
   allContactList1.Creator__c = 'Paul Gentile';
   allContactList1.Action__c = '[email protected]';
   allContactList1.OwnerId = '00550000001R0Fl';
   allContactList1.Note_Date__c = runtime;
   Insert allContactList1 ; 

   deleteRowsDevNotes qdnc = new deleteRowsDevNotes();
   test.starttest();
   qdnc.accountRec = accountRec1;

   qdnc.onloadmethod();


   qdnc.clone();

   qdnc.addContact();

   qdnc.saveChanges();

test.stoptest();

}
   }


   static testMethod void testdeleteRowsDevNotes() {
deleteRowsDevNotes clsObj = new deleteRowsDevNotes();
    Test.startTest();
    Sales_Dev_Notes__c [] notes = clsObj.getContacts();
    Test.stopTest();
    System.assertNotEquals(null, notes);
    }

}