Log abaixo:
Aug 20 00:24:05 npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
Aug 20 00:24:05 npm ERR! Failed at the countdown@1.0.0 start script.
Aug 20 00:24:05 npm ERR!
Aug 20 00:24:05 npm ERR! Exit status 1
Aug 20 00:24:05 npm ERR! countdown@1.0.0 start: node app.js
Aug 20 00:24:05 npm ERR! errno 1
Aug 20 00:24:05 npm ERR! code ELIFECYCLE
Aug 20 00:24:05 at bootstrap_node.js:625:3
Aug 20 00:24:05 at startup (bootstrap_node.js:204:16)
Aug 20 00:24:05 at Function.Module.runMain (module.js:694:10)
Aug 20 00:24:05 at Function.Module._load (module.js:498:3)
Aug 20 00:24:05 at tryModuleLoad (module.js:506:12)
Aug 20 00:24:05 at Module.load (module.js:566:32)
Aug 20 00:24:05 at Object.Module._extensions…js (module.js:664:10)
Aug 20 00:24:05 at Module._compile (module.js:617:28)
Aug 20 00:24:05 at Object.runInThisContext (vm.js:139:10)
Aug 20 00:24:05 at createScript (vm.js:80:10)
Aug 20 00:24:05 SyntaxError: Identifier ‘app’ has already been declared
Aug 20 00:24:05
Aug 20 00:24:05 ^
Aug 20 00:24:05 const app = express();
Aug 20 00:24:05 /usr/src/app/app.js:7
Aug 20 00:24:04
Aug 20 00:24:04 > node app.js
Aug 20 00:24:04 > countdown@1.0.0 start /usr/src/app
Já fiz algumas alterações no package.json mas não resolveu.