getting error “machineDefinition is undefined” I already follow steps?

I am using below package for demo application

https://www.npmjs.com/package/@opuscapita/fsm-workflow-core

I follow all steps whatever it is written in doc .But getting error
**machineDefinition is undefined**

here is my code
https://codesandbox.io/s/inspiring-banzai-xumr2?file=/src/index.js

var http = require(“http”);

let { MachineDefinition, Machine } = require(“@opuscapita/fsm-workflow-core”);

var machineDefinition = new MachineDefinition({
schema: {
initialState: “start”,
finalStates: [“finish”],
transitions: [{ from: “start”, event: “run”, to: “finish” }]
}
});

const object = { status: “none” };
const machine = new Machine(machineDefinition);
machine
.start({ object })
.then(({ object }) => {
console.log(machine.currentState({ object }));
// start
return machine.sendEvent({ object, event: “start” });
})
.then(({ object }) => {
console.log(machine.currentState({ object }));
// finish
});

//create a server object:
http
.createServer(function(req, res) {
res.write(“Hello World!”); //write a response to the client
res.end(); //end the response
})
.listen(8080); //the server object listens on port 8080

could you please tell me where I am doing wrong .?

One more thing this package is `Apache-2.0` licence .can I use this package in my real project ?