Some problems and their solutions

Main problems with a vermicomposter

Rotten smell	There is too much food	Decrease food intake.
Ammonia odor	Too much nitrogen rich material.(green and fresh materials)	Balance the system by adding materials rich in carbon. (newspaper, dead leaves, shredded cardboard)
Smell of sulfur (rotten egg)	The litter is full of water and there is a lack of air at the bottom of the vermicomposter.	Add newspaper or dry shredded cardboard. Open the lid a little and decrease the feed for a while.
Worms come out of the vermicomposter	The litter is too wet or too acidic.	Add newspaper or cardboard as before, for acidity add dried and powdered eggshells or a little wood ash.
Fruit fly	Food exposed to the air attracts flies and allows them to lay their eggs.	Always cover waste with a layer of litter. The use of beneficial nematodes and / or some diatomaceous earth is also highly recommended.
Ants	The inside of the vermicomposter is too dry.	Coat the legs of the vermicomposter with petroleum jelly and moisten the bins

Remember that vermicomposting is still a natural process. It is not an exact science. The purpose of this guide is to explain the mechanics in play and suggest a method of use. Make your own experience, compare your contributions to understand and improve.