PLS-00306: when calling a function from a PL/SQL block - sql

Question

I am getting the PLS-00306 error when I attempt to run a PL/SQL block that calls a variety of things including a function. The job of the function is to count how many cars belong to a certain model type. The function works if I call it in a SQL statement or it's own block, it just doesn't seem to work here.
This is the function:
CREATE OR REPLACE Function findtotalcarmodels(
model_name_in IN varchar2)
RETURN NUMBER
IS
counter NUMBER := 0;
CURSOR car_count_cur IS
SELECT model_name
FROM i_car
WHERE model_name = model_name_in;
Rec_car_details car_count_cur%ROWTYPE;
BEGIN
OPEN car_count_cur;
LOOP
FETCH car_count_cur INTO Rec_car_details;
EXIT WHEN car_count_cur%NOTFOUND;
counter := counter + 1;
END LOOP;
CLOSE car_count_cur;
RETURN counter;
END;
This is the Block:
SET SERVEROUTPUT ON FORMAT WRAP SIZE 12000
Declare
v_model VARCHAR2(40);
v_carcategory VARCHAR2(40);
v_totalcars NUMBER;
v_maxdate DATE:=TO_DATE(1, 'J');
Cursor carcur IS
SELECT *
FROM i_car;
CURSOR c1(v_car_registration VARCHAR2) IS
SELECT *
from i_booking a
WHERE a.registration=v_car_registration;
Begin
For car_rec in carcur
LOOP
v_maxdate:=TO_DATE(1, 'J');
for rec in c1(car_rec.registration)
loop
IF rec.date_reserved > v_maxdate
then
v_maxdate:=rec.date_reserved ;
If car_rec.Cost <=50000
THEN
v_carcategory := 'Budget Car';
End IF;
If car_rec.Cost BETWEEN 50000 AND 100000
THEN
v_carcategory := 'Standard Car';
End IF;
If car_rec.Cost >100000
THEN
v_carcategory := 'Premium Car';
End If;
end IF;
v_totalcars := findtotalcarmodels;
end loop;
DBMS_OUTPUT.PUT_LINE('Registration:'|| ' '|| car_rec.registration);
DBMS_OUTPUT.PUT_LINE('Cost:'|| ' $' || car_rec.Cost);
DBMS_OUTPUT.PUT_LINE('Model Name:'|| ' '|| car_rec.model_name);
DBMS_OUTPUT.PUT_LINE('Car Category:'|| ' '||v_carcategory);
DBMS_OUTPUT.PUT_LINE('Total number of Cars:'|| ' '||v_totalcars);
DBMS_OUTPUT.PUT_LINE('Most Recent Rental Date: '|| ' '||v_maxdate);
DBMS_OUTPUT.NEW_LINE;
END LOOP;
END;
/
Before I get slammed for the style of the PL/SQL block, just keep in mind that it is written to requirement and everything works well with the exception of the function.
If someone could point me in the right direction to call this function without error I would be very grateful.

Answer 1

It looks like you have missed to pass the IN parameter to the function.
Try like this,
v_totalcars := findtotalcarmodels('<model_name_in>');

Answer 2

Well, when i see things right, you don't fillup the parameter model_name. When you don't have an overriden function wihtout parameter you need to fill it up.
AS you can also see the PLS-00306 is telling you something about wrong number of arguments.