Can not run video using frappe-video scripting tool

I am creating tutorial videos using frappe video scripting tool but after running the example script or even developed ones. after log in event, process is getting terminated.
as bellow.
i have tried to solve the error but there is no events.js file in frappe-video directory

Running tests in:

  • Chrome 72.0.3626 / Linux 0.0.0

Printing and Branding
throw er; // Unhandled ‘error’ event

Error: spawn festival ENOENT
at Process.ChildProcess._handle.onexit (internal/child_process.js:190:19)
at onErrorNT (internal/child_process.js:362:16)
at $$testcafe_test_run$$r1KadJEEH$$ (eval at addTrackingMarkerToFunction (/home/suraj/frappe-video/frappe-video/node_modules/testcafe/lib/api/test-run-tracker.js:85:16), :8:39)
at _combinedTickCallback (internal/process/next_tick.js:139:11)
at process._tickDomainCallback (internal/process/next_tick.js:219:9)
npm ERR! errno 1
npm ERR! @ run-video: testcafe chrome "videos/printing.js"
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @ run-video script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

thank you,