SyntaxError: Unexpected token ?

[it-rcmart]

I have this error after installed 0.3.15 on Amazon Linux 2, Can anyone help? Thanks!

[root@vm /]#crontab-ui
Cron db path: /usr/lib/node_modules/crontab-ui/crontabs
/usr/lib/node_modules/crontab-ui/routes.js:2
var base_url = process.env.BASE_URL ?? '';
^

SyntaxError: Unexpected token ?
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. (/usr/lib/node_modules/crontab-ui/app.js:15:35)

[it-rcmart]

I have solved the problem by installed the latest nodejs 16.4.x