The idea YML file code does not prompt the solution

After trying many methods on the Internet, it still doesn't work , After half an hour of groping and setting , This problem is finally solved ：

Here's my solution , For reference only ：

1. First, confirm that two yml plug-in unit
   

2. stay setting Find it inside, as shown in the figure ：
   
   If the right box does not have two file name suffixes as shown in the figure , Add it manually ;

3. As shown in the figure, do not configure
   

4. apply,ok After the restart idea, And then I found out yml There is a prompt in the file ！
   

• over ~