This is too easy for 5 kyu, solved it in 3 minutes

Your code wasn't returning an array.

You get a similar error with the initial code:

function anagrams(word, words) {
}

The testing part assumes your function returns an array and tries to sort it, hence the error.

It was coming because instead of return statement I was printing the output using console.log(). It has nothing to do with sorting cause I was not using any sort array method. The code had only 30 lines of code and it was pointing error at lines 63 and 88, How is it even possible.

it apparently comes from your code: you're trying to sort an array that, at some point in the executions, isn't actully an array anymore.

Anyone know why I am seeing this.

TypeError: Cannot read property 'sort' of undefined
at testAnagrams
at /home/codewarrior/index.js:63:13
at /home/codewarrior/index.js:88:5
at Object.handleError

STDERR
/runner/frameworks/javascript/cw-2.js:237
throw ex;
^

TypeError: Cannot read property 'sort' of undefined
at testAnagrams (/home/codewarrior/index.js:56:18)
at /home/codewarrior/index.js:63:13
at /home/codewarrior/index.js:88:5
at Object.handleError (/runner/frameworks/javascript/cw-2.js:233:11)
at Object. (/home/codewarrior/index.js:3:6)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at [eval]:1:1
at ContextifyScript.Script.runInThisContext (vm.js:50:33)
at Object.runInThisContext (vm.js:139:38)
at Object. ([eval]-wrapper:6:22)