work item example calling wrong function

[jcyh0120]

I just saw this awesome project and tried to copy the Work item example code, pasted it to a js file.
Then, I run node "myfilename".js

It came out with the following error:

D:\nodejs>node test.js
D:\nodejs\test.js:94
          .schedule(function(d) { return d.availability ? p(d.availability) :
           ^
TypeError: undefined is not a function
    at Object.<anonymous> (D:\nodejs\test.js:94:12)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

D:\nodejs>node test.js
D:\nodejs\test.js:105
          .schedule(function(d) { return d.availability ? p(d.availability) :
           ^
TypeError: undefined is not a function
    at Object.<anonymous> (D:\nodejs\test.js:105:12)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:129:16)
    at node.js:814:3

I think the demo code calls the wrong function at Line:94 , 105

89 var t = schedule.tasks()
90           .id(function(d) { return d.name; })
91           // our length is in hours, convert to minutes
92           .duration(function(d) { return d.length * 60; })
93           // use later.parse.text to parse text into a usable schedule
94          .schedule(function(d) { return d.availability ? p(d.availability) : undefined; })
95           // convert minSchedule to minutes
96           .minSchedule(function(d) { return d.minSchedule ? d.minSchedule * 60 : undefined; })
97           // resources are the people the tasks have been assigned to
98           .resources(function(d) { return d.assignedTo; });
.
.
.
105         .schedule(function(d) { return d.availability ? p(d.availability) : undefined; });

I changed all the ".schedule" to ".available", then it works fine.