Java Weka error msg-没有足够的带有类标签的培训实例（必需：1，提供：0）！

我的Weka代码不起作用
我不知道如何修正这个错误
请给我一些建议
（我使用了weka.jar（版本3.6.11））

以下是错误消息

Exception in thread "main" weka.core.WekaException: weka.classifiers.functions.Logistic: Not enough training instances with class labels (required: 1, provided: 0)!
    at weka.core.Capabilities.test(Capabilities.java:1138)
    at weka.core.Capabilities.test(Capabilities.java:1023)
    at weka.core.Capabilities.testWithFail(Capabilities.java:1302)
    at weka.classifiers.functions.RBFNetwork.buildClassifier(RBFNetwork.java:153)
    at WEKATutorial.learnPredictiveModel(WEKATutorial.java:81)
    at WEKATutorial.executeWekaTutorial(WEKATutorial.java:24)
    at WEKATutorial.main(WEKATutorial.java:18)

我在网上搜索过，但我没有答案。

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我很沮丧（

尝试将新实例添加到createInstance方法中的associatedDataSet：

associatedDataSet.add(instance); 

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按以下方式更改addInstance代码

private void addInstance(Instances trainingDataSet, double age, String gender, int numLogins) {
    Instance instance = createInstance(trainingDataSet, age, gender, numLogins);
    trainingDataSet.add(instance);
}

private void addInstance(Instances trainingDataSet, double age, String gender, int numLogins) {
    Instance instance = createInstance(trainingDataSet, age, gender, numLogins);
    trainingDataSet.add(instance);
}