Your source file can't have the `.ngo' extension.
Error: Could not open `filename'
Error: Could not create `filename'
Error: The disk is full.
Error: There is a long entry longer than the 17k limit.
Error: The list of short entries is too long.
Warning: Can't find the see-also reference `ref'
Warning: There are too many `:'s in `filename'
There are too many references to other files.
Your source file can't use the `.ng' extension.
You must have a `!name:' field in the control file.
You need both a title and a file name for menu items.
You can only have one `!name:' field.
The `!menu:' field must be before the first file name.
You need to use a `!menu:' field with more than file name.
There are too many items in this menu.
The `!credits:' field must be before any menu or file name.
There are too many lines in the `!credits:' field.
Warning, the credit is too long.
`filename' is not a Norton Guides object file.
There are too many files in this database.
Warning: invalid format for !seealso:
Warning: can't find file for !seealso:
There is an error in the database file.