Have trouble running "the-rewarder"

[Flyy-yu]

This is what I got by running "npm run the-rewarder" with the original "the-rewarder.challenge.js" file.
No problem with all other challenges.

All contracts have already been compiled, skipping compilation.


  [Challenge] The rewarder
    1) "before all" hook for "Exploit"
    2) "after all" hook for "Exploit"


  0 passing (433ms)
  2 failing

  1) [Challenge] The rewarder
       "before all" hook for "Exploit":
     Error: Contract error: contract binary not set. Can't deploy new instance.
This contract may be abstract, not implement an abstract parent's methods completely
or not invoke an inherited contract's constructor correctly

      at Function.new (node_modules/@truffle/contract/lib/contract/constructorMethods.js:47:13)
      at Context.<anonymous> (test/the-rewarder/the-rewarder.challenge.js:23:55)
      at processTicksAndRejections (internal/process/task_queues.js:97:5)

  2) [Challenge] The rewarder
       "after all" hook for "Exploit":
     TypeError: Cannot read property 'roundNumber' of undefined
      at Context.<anonymous> (test/the-rewarder/the-rewarder.challenge.js:76:37)
      at processImmediate (internal/timers.js:456:21)



npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! @ the-rewarder: `npm run compile && npx mocha --timeout 50000 --exit test/the-rewarder/the-rewarder.challenge.js`
npm ERR! Exit status 2
npm ERR! 
npm ERR! Failed at the @ the-rewarder script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.