ok, so once i get to page 102 I type in what it says and I get this out put

SQLite version 3.5.4
Enter ".help" for instructions
sqlite> CREATE TABLE stories (
...> "id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
...> "name" varchar(255) DEFAULT NULL,
...> "link" varchar(255) DEFAULT NULL,
...> "created_at" datetime DEFAULT NULL,
...> "updated_at" datetime DEFAULT NULL
...> );
Unable to open database "db/development.sqlite3": unable to open database file

Am i doing something wrong?
I'm on Mac OS 10.5.4

Thanks in advance.