TypeError: Maker.create is not a function

[TheScalper]

Following the test-chain-guide.md walkthrough in Interacting with Maker Protocol contracts section.
Copy the below example in your js file
Run the file with node vault.js

When I execute the vault.js I have the following error :
~/dev/test$ node vault.js
error TypeError: Maker.create is not a function
at start (/home/david/dev/test/vault.js:8:35)
at Object. (/home/david/dev/test/vault.js:35:1)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)
at startup (internal/bootstrap/node.js:283:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)

Did I miss something?