trying to implement the Modal using Lightning:overLayLibrary as per this link lightningOverlayLibrary i am facing the below issue

Uncaught (in promise) TypeError: Cannot read property 'la' of undefined
    at Object.dispatchGlobalEvent (aura_prod.js:757)
    at a (lightning-overlay-utils.js:2)
    at new Promise (<anonymous>)
    at Promise.all.then.a


    <lightning:button label="New REcord" name="modal"  onclick="{!c.handleShowModal}"></lightning:button>


doInit : function(component, event, helper) {

   handleShowModal: function(component, evt, helper) {
    var matterid = component.get("v.recordId");
    var modalBody;
    $A.createComponent("c:demoPagecomponent", {},
       function(content, status) {
           if (status === "SUCCESS") {
               modalBody = content;
                header: "Application Confirmation",
                   body: modalBody, 
                   showCloseButton: true,
                   cssClass: "mymodal",
                   closeCallback: function() {
                       alert('You closed the alert!');


  • Would you mind adding your code? We can replicate that in our org and see whats wrong. Thanks May 29, 2018 at 15:23
  • updated please look into it . i think this line causing problem component.find('overlayLib').showCustomModal({
    – Raghav
    May 29, 2018 at 15:47
  • Where you are getting this error? In lightning App? or Lightning Experience ?
    – A.Bretto
    May 30, 2018 at 6:54
  • it is in Lightning App
    – Raghav
    May 31, 2018 at 5:04
  • You are using component.find('overlayLib') but I cannot find this attribute in your markup... Jun 3, 2018 at 6:42

2 Answers 2


I came across this question while finding the solution for the same and after a few hard luck, I found that I was trying to preview it using a Lightning:app and that's what throwing this error. If you try to access somewhere in a record page or quick action then it will work without throwing this error.

lightning:overlayLibrary will not work in the lightning:app.

I hope this tip will help someone for sure.


In order to Create a popup inside Lightning:app , you need to create a custom popup , Please follow this link and put into the modal body the component tag you want to display , I tried this and it worked ! .


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