No instance for Database.SQLite.Simple.FromField.FromField Char
You are using res as a [String]:
mapM_ putStrLn resIt is equivalent to [[Char]]. But queryNamed returns a list of rows, so each row has type [Char]. There is an instance FromField a => FromRow [a], but there is no instance FromField Char. That is what the error messages says.
I never used sqlite-simple, but it is clear that each row contains a number of fields, so you are trying to fetch a row that contains a number of fields of type Char. That makes no sense. Depending on actual database scheme, each row should be e.g. a number of text field, then the res can have type [[String]]. In that case you should use it like the next:
mapM_ (mapM_ putStrLn) (res :: [[String]])