error: parse error before "NSData"

followed by four

error: parse error before '{' token.

When I double-clicked on the first error message, it took me to MyDocument.h. After comparing this to some of the files in FoundationFramework/Headers (such as NSBundle.h), I saw that all the variable declarations in the pre-made files ended in semicolons. Unfortunately, this was not made clear in the article. The code in MyDocument.hshould look something like this:

#import <Cocoa/Cocoa.h>

@interface MyDocument : NSDocument
{id IBOutlet textView;
NSData *fileData;
}
@end

After adding the semicolons, my code compiled with no problems. I composed, saved, and re-opened this message in the resulting program.