What are the ethical and legal issues of Autonomous Weapons Systems ?

From the 19th to 21st Centuries, there has been a drastic transformation in the means and methods of warfare due to advancements in technology. The rules of International Humanitarian Law (IHL) have always been reactive to new advancements. Notwithstanding this, the development and use of autonomous weapons pose unique challenges in the application of IHL. Discuss this and offer potential solutions to overcome these challenges.