Invalid object name in CTE - sql

Question

I have tried CTE combining two table in my below query and getting the Invalid Object error but it exists .Can Anyone guide me?
;WITH t1
AS (
SELECT DepId
, COUNT(EmpId) AS TotalHeadCount
FROM Emploee
WHERE (datepart(yyyy, DOJ) BETWEEN 2005 AND 2017)
AND STATUS = 0
GROUP BY DepId
)
, t2
AS (
SELECT DepId
, COUNT(EmpId) AS NewJoinees
FROM Emploee
WHERE (DATEPART(yyyy, DOJ) = 2017)
AND (DATEPART(mm, DOJ) = 01)
AND datepart(mm, DOJ) >= 12
AND STATUS = 0
GROUP BY DepId
)
, t3
AS (
SELECT Tobehired AS TOBEHIRED
, OpenPosition AS OPENPOSITION
, STATUS
FROM Employee1
)
SELECT t1.DepId
, CASE
WHEN TotalHeadCount IS NULL
THEN '0'
ELSE TotalHeadCount
END AS TotalHeadCount
, CASE
WHEN NewJoinees IS NULL
THEN '0'
ELSE NewJoinees
END AS NewJoinees
, Tobehired
, OpenPosition
, STATUS
FROM t1
FULL JOIN t2
ON t1.DepId = t2.DepId
FULL JOIN t3
ON t1.DepId = t3.DepId

Answer 1

There's a time and a place for use of Common table expressions. I don't think this was one of them... Complex joins with nested subqueries, recursion, refactoring for maintainability. A two table join doesn't seem to fit the bill in my opinion.
SELECT E.DEPID
, sum(case when datepart(yyyy,E.doj) between 2005 and 2017 and status =0 then 1 else 0 end as TotalHeadCount
, sum(case when E.doj >= cast('2017-01-12' as datetime) then 1 else 0 end as NewJoinees
, E1.Tobehired
, E1.OpenPosition
, E1.STATUS
FROM Employee E
LEFT JOIN Emplyee1 E1
on E.DepID = E1.DepID
GROUP BY E.DEPID,
, E1.Tobehired
, E1.OpenPosition
, E1.STATUS