SQL Error: ORA-30649: missing DIRECTORY keyword

All I wanted to do was to add a column to a pre existing table in the Database and give it a default value.
My SQL was:

ALTER TABLE Table1
ADD Column1 VARCHAR2(1) not null default 'N';


I kept getting this error:



ORA-30649: missing DIRECTORY keyword
Cause: DEFAULT DIRECTORY clause missing or incorrect.
Action: Provide the DEFAULT DIRECTORY.


Well, google did not help. What is a default directory anyway? So I played with my SQL a little bit more and came up with:



ALTER TABLE Table1
ADD Column1 VARCHAR2(1) default 'N' not null;

It was just a sequence problem in the SQL Statement. Im a no SQL Expert and when I look at such Oracle error numbers it does nothing but confuse me.