您正在使用非常旧的Ejabberd版本.最新的是17.04，从16.01开始，API权限框架有很多更改. api_permission相关的配置来自16.12版本.有关更多详细信息，请参考此.

You are using very old version of Ejabberd. Latest is 17.04 which has lots of changes in API permission framework from 16.01 . api_permission related configuration came in 16.12 version. Please refer this for more detail.