报错如下：

Error creating bean with name 'helloController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'cupszie' in value "cupsize: ${cupszie},age: ${age}"

代码如下：

application.yml代码

server:
 port: 8081
 context-path: /girl
cupsize: B
age: 20
content: "cupsize: ${cupszie},age: ${age}"

HelloController.class代码

@RestController
public class HelloController {

   @Value("${cupsize}")
   private String cupsize;

   @Value("${age}")
   private Integer age;

   @Value("${content}")
   private String content;

   @RequestMapping(value = "/hello",method = RequestMethod.GET)
   public String say(){
       return content;
   }
}

代码跟老师的一样，请教老师这是为什么呢