start server.js error

[fatihemir]

C:\nodejs\kurento-rtmp-master>node server.js
C:\nodejs\kurento-rtmp-master\node_modules\node-media-server\node_trans_server.js:21
async run() {
^^^
SyntaxError: Unexpected identifier
at createScript (vm.js:56:10)
at Object.runInThisContext (vm.js:97:10)
at Module._compile (module.js:542:28)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at Object. (C:\nodejs\kurento-rtmp-master\node_modules\node-media-server\node_media_server.js:11:25)