If a user tries to provide an invalid index like i/asdf, i/123 (where there are less than 123 groups), etc., the just provides a message that the index provided is invalid. The message would be better if it provided the reason as to why the index was invalid.
If a user tries to provide an invalid index like
i/asdf,i/123(where there are less than 123 groups), etc., the just provides a message that theindex provided is invalid. The message would be better if it provided the reason as to why the index was invalid.