Not able to use Procedure

Question

Hello Experts
I’m trying to add a record into my table. I successfully created & complied a procedure (addnewrow). But I m not able to call this procedure. I used call addnewrow() and I had the following error.
Error starting at line 1 in command:
call addnewrow()
Error report:
SQL Error: ORA-06575: Package or function ADDNEWROW is in an invalid state
06575. 00000 - "Package or function %s is in an invalid state"
*Cause:    A SQL statement references a PL/SQL function that is in an
invalid state. Oracle attempted to compile the function, but
detected errors.
*Action:   Check the SQL statement and the PL/SQL function for syntax
errors or incorrectly assigned, or missing, privileges for a
referenced object.
Can please anybody show me how to call a procedure. Here is my procedure
--ADD NEW ROW WITH RECORD
create or replace PROCEDURE addnewrow as
v_isbn books.isbn%type := '72390';
v_category books.category%type := 'Advance Application Server';
v_title books.title%type := 'OCM Level I';
v_num_pg books.num_pages%TYPE := 340;
v_copy books.copyright% TYPE := 2008;
v_author1 books.author1%type := 2;
v_author2 books.author2%type := 3;
v_author3 books.author3%type := 4;
begin
insert into books
values(v_isbn, v_category, v_title, v_num_pg, v_copy, v_author1, v_author2, v_author3);
end;
Thanks a lot in advance

Answer 1

Thanks Frank & Peter for replies. Well I fixed the code as per your suggestion but still having the same problem. Infect I got a warning when i compile the procedure as follows
Warning: execution completed with warning
PROCEDURE addnewrow Compiled.
Here is the procedure
create or replace PROCEDURE addnewrow as
v_isbn books.isbn%type := '72390';
v_category books.category%type := 'Advance Application Server';
v_title books.title%type := 'OCM Level I';
v_num_pg books.num_pages%TYPE := 340;
v_copy books.copyright%TYPE := 2008;
v_author1 books.author1%type := 2;
v_author2 books.author2%type := 3;
v_author3 books.author3%type := 4;
begin
insert into books(ISBN, category, title, num_pages, price, copyright, author1, author2, author3)
values(v_isbn, v_category, v_title, v_num_pg, v_copy, v_author1, v_author2, v_author3);
end;
Once again when i say call addnewrow();
I got the following error;
Error starting at line 1 in command:
call addnewrow()
Error report:
SQL Error: ORA-06575: Package or function ADDNEWROW is in an invalid state
06575. 00000 - "Package or function %s is in an invalid state"
*Cause:    A SQL statement references a PL/SQL function that is in an
invalid state. Oracle attempted to compile the function, but
detected errors.
*Action:   Check the SQL statement and the PL/SQL function for syntax
errors or incorrectly assigned, or missing, privileges for a
referenced object.