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我尝试基于https://github.com/amzn/alexa-skills-kit-java创建一个HelloWorld技能但是当我测试lambda函数时它显示了这个错误

{
  "errorMessage":"com.amazon.speech.speechlet.SpeechletRequestHandlerException: Could not validate SpeechletRequest null using verifier ApplicationIdSpeechletRequestVerifier, rejecting request",

  "errorType": "java.lang.RuntimeException",

  "stackTrace": [    "com.amazon.speech.speechlet.lambda.SpeechletRequestStreamHandler.handleRequest(SpeechletRequestStreamHandler.java:101)",
 "helloworld.HelloWorldSpeechletRequestStreamHandler.handleRequest(HelloWorldSpeechletRequestStreamHandler.java:43)"

 ],

  "cause": {

    "errorMessage": "Could not validate SpeechletRequest null using 
verifier ApplicationIdSpeechletRequestVerifier, rejecting request",
    "errorType": "com.amazon.speech.speechlet.SpeechletRequestHandlerException",

    "stackTrace": [
      "com.amazon.speech.speechlet.SpeechletRequestHandler.handleSpeechletCall(SpeechletRequestHandler.java:73)",
      "com.amazon.speech.speechlet.lambda.SpeechletRequestStreamHandler.handleRequest(SpeechletRequestStreamHandler.java:98)",
      "helloworld.HelloWorldSpeechletRequestStreamHandler.handleRequest(HelloWorldSpeechletRequestStreamHandler.java:43)"
    ]
  }
}

这是我的Java文件

public final class HelloWorldSpeechletRequestStreamHandler extends SpeechletRequestStreamHandler {
    private static final Set<String> supportedApplicationIds = new HashSet<String>();
    static {
        /*
         * This Id can be found on https://developer.amazon.com/edw/home.html#/ "Edit" the relevant
         * Alexa Skill and put …