调用templateMessage.send 的问题？

WAService.js:1 Uncaught (in promise) Error: errCode: -404011 cloud function execution error | errMsg: cloud.callFunction:fail requestID 73534f91-e2d3-11e9-bd2f-525400dee61a, cloud function service error code -504002, error message errCode: -501001 resource system error | errMsg: openapi.templateMessage.send:fail source.on is not a function; at openapi.templateMessage.send api; ; at cloud.callFunction api; 

请问怎么解决这个问题，所有部署都按照官方的做了，也反复检查了还是解决不了问题