Too few parameters. Expected 1. What does it mean?

I have a Access database on a tomcat server. Normal database operations works just perfect, so I don't think there is anything wrong with the connection. My problem is two sql querys that both give me the same error: Too few parameters. Expected 1.

When i run them in Access alone, I get what I want... What is the problem?

SELECT Dep.DeptName, Dep.Owes, COUNT(Car.OutTo) AS CarsOut, SUM(Car.Cost*((Today.Date-Car.OutOn)+1)) AS Liability, Dep.Owes+Liability AS Total
FROM Today, (Dep INNER JOIN Emp ON Dep.DeptName=Emp.DeptName) INNER JOIN Car ON Emp.Name=Car.OutTo
GROUP BY Dep.DeptName, Dep.Owes
HAVING ((Dep.DeptName)<>"It")

SELECT Car.CarNr, Car.Make
FROM (CanTake INNER JOIN Emp ON CanTake.Name = Emp.Name) INNER JOIN Car ON CanTake.Make = Car.Make
WHERE (((Car.Make)=[CanTake].[Make]) AND ((CanTake.Name)=[Emp].[Name]) AND ((Car.OutTo) Is Null) AND ((Emp.Name)=[Jenny]));

Just an other problem: When running the last query in access, why do i have to type in the Emp.Name in a "popup" form asking for parameter value? Doesn't Emp.Name = Jenny do the trick? When i remove that last criteria i get the whole list, so it got to do something right..

I have solved the problems

SELECT Dep.DeptName, Dep.Owes, COUNT(Car.OutTo) AS CarsOut, SUM(Car.Cost*((Today.Date-Car.OutOn)+1)) AS Liability, Dep.Owes+Liability AS Total
FROM Today, (Dep INNER JOIN Emp ON Dep.DeptName=Emp.DeptName) INNER JOIN Car ON Emp.Name=Car.OutTo
GROUP BY Dep.DeptName, Dep.Owes
HAVING Dep.DeptName <> 'It'

and

SELECT Car.CarNr, Car.Make
FROM (CanTake INNER JOIN Emp ON CanTake.Name = Emp.Name) INNER JOIN Car ON CanTake.Make = Car.Make
WHERE Car.Make = CanTake.Make AND CanTake.Name = Emp.Name AND Car.OutTo Is Null AND Emp.Name = 'Jenny'