Expecting a ‘Mapping‘ node but got ‘prefix 异常，

在编写 application-dev.yml 时，

spring:
  datasource:
    username: qianyi
    password: Xia123456
    url: jdbc:oracle:thin:@localhost:1521:orcl
    driver-class-name: oracle.jdbc.driver.OracleDriver
  mvc:
    view:
      prefix: /WEB-INF/jsp/ 
      suffix: .jsp   

prefix前面报  Expecting a 'Mapping' node but got 'prefix 异常 ，最后前面对齐了，还是报错，奇怪，然后把

      prefix: /WEB-INF/jsp/ 
      suffix: .jsp 

这一小段圈起来，用tab键来回挪，最后在这两行后面都加了几个回车，再保存，问题解决