How to approach when "maximum number of classifiers" appeared as error in Watson linkage

In here, it explains how to approach when an error like this below appeared when Watson linkage.

設定方法

(1) Log into IBM CLOUD and click on services.

(2) Click on [Activate Watson Studio] on the page [Natural Language Classifier].

(3) The classifier like the one below will show, so click [・・・] in order from old to new [Date created], and click on [Delete], it will solve an error.