@Override
    public Builder errorDecoder(final ErrorDecoder errorDecoder) {
      this.errorDecoder = checkNotNull(errorDecoder, "Argument errorDecoder must be not null");
      return this;
    }
Sets error decoder.

@param errorDecoder error deoceder
@return this builder
vertx/feign-vertx/src/main/java/feign/VertxFeign.java