> File google-services.json is missing. The Google Services Plugin cannot function without it. 
  Searched Location: 
  C:\Users\path...\gms_android\app\src\nullnull\google-services.json
  C:\Users\path...\gms_android\app\src\release\google-services.json
  C:\Users\path...\gms_android\app\src\nullnullRelease\google-services.json
  C:\Users\path...\gms_android\app\src\nullnull\release\google-services.json
  C:\Users\path...\gms_android\app\src\release\nullnull\google-services.json
  C:\Users\path...\gms_android\app\google-services.json

我下载了。json文件，它的位置在这里

它一直工作到现在，突然我开始得到这个错误，不知道如何解决它

编辑:忘了说我已经试过几次使缓存失效了 恢复，清理，重建。