.doOnError() is an operator, and is not as such a part of the Subscriber.
Therefore, having a .doOnError() does not count as an implemented onError().
About the question in one of the comments, of course it is possible to use lambdas.
In this case simply replace
.doOnError(throwable -> L.e(TAG, "Throwable " + throwable.getMessage()))
.subscribe(s -> createListView(s, view))
with
.subscribe(s -> createListView(s, view),
throwable -> L.e(TAG, "Throwable " + throwable.getMessage()))