TypeError: this.emit is not a function

[ghost]

The program started out with 'once' being undefined. I followed the solution and came up with a blank PDF. After following that solution too. I came up with one on my own

Uncaught TypeError: this.emit is not a function
    at exportJob.js:237
    at CallbacksRegistry.apply (C:\Users\test\test-project\node_modules\electron\dist\resources\electron.asar\common\api\callbacks-registry.js:48)
    at EventEmitter.<anonymous> (C:\Users\test\test-project\node_modules\electron\dist\resources\electron.asar\renderer\api\remote.js:299)
    at emitThree (events.js:116)
    at EventEmitter.emit (events.js:197)
(anonymous) @ exportJob.js:237
apply @ C:\Users\test\test-project\node_modules\electron\dist\resources\electron.asar\common\api\callbacks-registry.js:48
(anonymous) @ C:\Users\test\test-project\node_modules\electron\dist\resources\electron.asar\renderer\api\remote.js:299
emitThree @ events.js:116
emit @ events.js:197

The PDF is still generated though.
Is there any way to resolve this?