I receive an unexpected token error

/app/node_modules/ws/lib/websocket.js:345
      ...options
      ^^^
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.<anonymous> (/app/node_modules/ws/index.js:3:19)

It seems you may be using an older version of node, could you try updating the node’s version to v12?

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