Federation签名Demo报错

也遇见了。java
Failed to get a federation token.
Error code: InvalidApi.NotFound
Error message: Specified api is not found, please check your url and method.
com.aliyuncs.exceptions.ClientException: InvalidApi.NotFound : Specified api is not found, please check your url and method.
    at com.aliyuncs.DefaultAcsClient.parseAcsResponse(DefaultAcsClient.java:139)
    at com.aliyuncs.DefaultAcsClient.getAcsResponse(DefaultAcsClient.java:89)
    at com.aliyun.sts.demo.test.StsServiceSample.getFederationToken(StsServiceSample.java:35)
    at com.aliyun.sts.demo.test.StsServiceSample.main(StsServiceSample.java:66)