Wikipedia describes communism as a stateless society.

A communist society entails the absence of private property and social classes, and ultimately money and the state.

In response to the question “What will be the course of this revolution?” in The Principles of Communism (1847), Friedrich Engels wrote: “Above all, it will establish a democratic constitution, and through this, the direct or indirect dominance of the proletariat.” While Marxists propose replacing the bourgeois state with a proletarian semi-state through revolution (dictatorship of the proletariat), which would eventually wither away, anarchists warn that the state must be abolished along with capitalism. Nonetheless, the desired end results (a stateless communal society) are the same.

How do you explain the existence of anarchist communism if the two are mutually exclusive?