here my Controller class

public class SalesOrder {
  public Order record{get;set;}
    public SalesOrder (ApexPages.standardcontroller std)
     { 
       record = new Order();           
     } 
  public pagereference dosave(){
      record.QuoteId = ApexPages.currentPage().getParameters().get('quoteID');
       insert record;
       ApexPages.AddMessage(new ApexPages.Message(ApexPages.Severity.CONFIRM,'Record Created Successfully.Thank you!'));
       pagereference page=new pagereference('/apex/SalesOrder');         
       return page;         
    }     
  public pageReference Cancel(){        
         pagereference page = new pageReference('/apex/QuoteVfPage');
         page.setRedirect(true);
         return page;
     }   
}
 here is test class

@istest
Private class TestSalesOrder{
    Static TestMethod void Dosave(){
        Test.startTest();
        
            PageReference pageRef = Page.SalesOrder;
            Test.setCurrentPageReference(pageRef);
            Account a=new Account(Name='test1',Phone='9458383336');   // creating account with only mandatory Fields
            insert a;
            Contact c = new Contact(LastName='Test',AccountId=a.Id);  // creating contact with only mandatory Fields
            insert c;
           // creating opportunity with only mandatory Fields
            Opportunity opp = new Opportunity(Name='Test Opp',AccountId=a.Id,StageName='closedwon',CloseDate=Date.Today());
            insert opp;
            // Creating Quote with only mandatory Fields
            Quote q=new Quote(Name='testquote',opportunityId=opp.Id);
            insert q;
            ApexPages.currentPage().getParameters().put('quoteID',q.Id );   
            Order ord = new Order(AccountId='a.Id',Name='test',status='draft',EffectiveDate=system.today());               
            Insert ord;
            ApexPages.standardcontroller std;
            SalesOrder sOrder = new SalesOrder(std);
            sOrder.dosave();
            sOrder.Cancel();
            
        Test.stopTest();
    }
    
    Static TestMethod void Cancel(){
        Test.StartTest();
        PageReference pageRef = Page.QuoteVfPage;
      Test.setCurrentPageReference(pageRef);
     }
}

when i am running my test class i am getting error