Rspec as Test Engine does not work

[xecutioner]

I am trying to have rspec set as test engine for a project I am working on.
However, Here is the error that is throwing out

Running unit tests...
[2016-06-02 11:53:43] ERROR 2: Invalid argument supplied for foreach() at [/Users/admin/dev/kantid/.arcanist-extensions/rspec_test_engine/src/RSpecTestEngine.php:31]
arcanist(head=master, ref.master=2234c8cacc21), phutil(head=master, ref.master=bd56873ae4c0), rspec-test-engine()
  #0 RSpecTestEngine::parseOutput(string) called at [<rspec-test-engine>/src/RSpecTestEngine.php:19]
  #1 RSpecTestEngine::run() called at [<arcanist>/src/workflow/ArcanistUnitWorkflow.php:167]
  #2 ArcanistUnitWorkflow::run() called at [<arcanist>/src/workflow/ArcanistDiffWorkflow.php:1340]
  #3 ArcanistDiffWorkflow::runUnit() called at [<arcanist>/src/workflow/ArcanistDiffWorkflow.php:1228]
  #4 ArcanistDiffWorkflow::runLintUnit() called at [<arcanist>/src/workflow/ArcanistDiffWorkflow.php:483]
  #5 ArcanistDiffWorkflow::run() called at [<arcanist>/scripts/arcanist.php:392]