Component Initialization Error: cannot read property 'g'

Question

Everything was working fine with this component a couple days ago. Then I added an event and now I'm getting a strange error:

Uncaught Component class instance initialization error [Cannot read property 'g' of undefined] Callback failed: serviceComponent://ui.flexipage.components.page.FlexipageControllerV2/ACTION$getPage function: a.H.wd

Markup:

client side controller, I'm pretty sure it has to do with the init method because It says 'component initialization':

doInit : function(component, event, helper) { var questionlist = component.get("c.getQuestionList"); questionlist.setCallback(this, function(response){ var state = response.getState(); if(state == "SUCCESS"){ component.set("v.Questions",response.getReturnValue()); } }); component.set("v.index",0); $A.enqueueAction(questionlist); },

apex controller:

public class QuestionViewerController { @AuraEnabled public static List getQuestionList(){ return [Select id,body__c,answer__c,Name,Type__c,Explanation__c,Category__c From Question__c]; } }

Why getting Error: cannot read property 'g'?

Ankit Yadav · Accepted Answer

This Error:cannot read property 'g' is coming because of doInit event, which you have added in component page and you did a mistake while defining handler on the component page. It more looks like your event handler declaration is causing the problem. You should not be using value="{!this}", as this would try to handle component initialisation. I am guessing it is conflicting with you doInit handler throwing the error. There must be only one aura:valueInit event for a given component. Reference : https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/ref_aura_valueInit.htm That being said , the handler "QuestionAddedEvent" does not mention which event you are handling , It must ideally take an event=""attribute to let know which event you are handling in the action.Something like the following This also makes sense why your component stopped working as soon as this handler was introduced.

Component Initialization Error: cannot read property 'g'

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