Hyperledger fabcar node enrollAdmin js error

Question

When I run node enrollAdmin.js I get this error :

/home/<username>/fabric-samples/fabcar/node_modules/fabric-client/lib/Client.js:742
    async _createOrUpdateChannel(request, have_envelope) {
          ^^^^^^^^^^^^^^^^^^^^^^

SyntaxError: Unexpected identifier
    at createScript (vm.js:56:10)
    at Object.runInThisContext (vm.js:97:10)
    at Module._compile (module.js:549:28)
    at Object.Module._extensions..js (module.js:586:10)
    at Module.load (module.js:494:32)
    at tryModuleLoad (module.js:453:12)
    at Function.Module._load (module.js:445:3)
    at Module.require (module.js:504:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/<username>/fabric-samples/fabcar/node_modules/fabric-client/index.js:25:18)

Can someone tell me how to solve this?