Linq expression multiple left outer join error

Linq expression multiple left outer join error

I am unable to execute the below linq.
from p in Patients
join q in MURWorksheets on p.PatientId equals q.PatientId into step1
from s in step1.DefaultIfEmpty()
join t in MURWorksheetAnswers on s.MURWorksheetId equals t.MURWorksheetId
into step2
from s2 in step2.DefaultIfEmpty()
select new {p.FirstName , Date = (s.MURDate == null ? DateTime.Now.Date :
s.MURDate),
s2.MURQuestionnaireId,s2.MURExpctedAnswersId};
Here is the sql for the same for your reference.
select a.FirstName,b.MURDate,c.MURQuestionnaireId,c.MURWorksheetAnswersID
from Patients as a
left join MURWorksheet as b on a.PatientId = b.PatientId
left join MURWorksheetAnswers as c on b.MURWorksheetId = c.MURWorksheetId