READ statement required for OPEN I-O on file

  Explanation:  The program opens the file in I-O mode, but does not
  contain a READ statement. A DELETE or REWRITE operation on a
  sequentially accessed file requires a previously executed READ or
  START statement.

  User Action:  You must take one of the following actions:

    a. Add a READ statement to your program.

    b. Check the file declaration for the EXTERNAL attribute and
       add one to your program, if appropriate.