Need help with Oracle sql and I am using Aqua studio.

I have created a very simple Oracle stored procedure using Aqua studio. When I execute/alter  the code below no errors are displayed and the stored procedure is created. However if I look in Aqua studio under the procedures folder there is a little red symbol next to the stored procedure? If I then try to execute the stored procedure I get an error message in red that looks like below:

So since the stored procedure was actually created, I thought that there were no syntax errors. However, according to the error message,
something is wrong, and I don't know why? Can anyone help me out here, to figure out what is wrong?

DBMS_OUTPUT

> Script lines: 1-1 -------------
 ORA-0900 invalid SQL Statement
Script line 1, statement line 1, coumn 0



CREATE OR REPLACE PROCEDURE "NARTI"."myProcedure"
AS
      dbNAME            VARCHAR(25);
        sqlStatement       VARCHAR(25);

BEGIN
      BEGIN
            sqlStatement := 5;
      END

      DBMS_OUTPUT.PUT_LINE('End of stored procedure myProcedure');

END myProcedure