Client Tools :: Creating Procedure Using SQL Developer?

I am trying to get my stored procedures together again after many years of working on MS SQL server. I'm alternating between using SQL-Plus and Oracle SQL Developer for Mac. In SQL Developer - which I like to use - I keep getting errors at the point where the END command for the package header occurs and the create command for the package body starts.

I've found that if I run the following in SQL-Plus I'm OK but if I try it from SQL Developer I get a compile error such as following or else an error telling me that it expects function, or pragma or something to that effect:

Error(8,1):PLS-00103:Encountered the symbol "/"

The code is as follows:
--------------------------------------
CREATE OR REPLACE PACKAGE MACR_SAMPLE_PROC_4 AS
PROCEDURE sampleproc_4(
pParam1 in integer,
pParam2 out varchar2);
END MACR_SAMPLE_PROC_4;

[code].....