Method error

src/main/java/io/reactivex/rxjava3/core/Single.java:917–923

Signals a Throwable returned by the callback function for each individual SingleObserver. Scheduler: error does not

(@NonNull Supplier<? extends @NonNull Throwable> supplier)

     * @return the new {@code Single} instance
     */
    @CheckReturnValue
    @NonNull
    @SchedulerSupport(SchedulerSupport.NONE)
    public static <@NonNull T> Single<T> error(@NonNull Supplier<? extends @NonNull Throwable> supplier) {
        Objects.requireNonNull(supplier, "supplier is null");
        return RxJavaPlugins.onAssembly(new SingleError<>(supplier));
    }

    /**
     * Returns a {@code Single} that invokes a subscriber's {@link SingleObserver#onError onError} method when the