In Hydra-GTK, I've specified my target name as https://example.com
(it's not www) and mentioned protocol as https-post-form
and then entered username and password list and then I started.
But I got this error message:
Hydra (http://www.thc.org/thc-hydra) starting at 2018-01-05 01:06:43
[ERROR] Invalid target definition!
[ERROR] Either you use "www.example.com module [optional-module-parameters]" *or* you use the "module://www.example.com/optional-module-parameters" syntax!