topic Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')" in ArcGIS Experience Builder Questions

HELP! Error Message "Cannot read properties of undefined (reading 'type')"

OLIVIALUNSFORD — Wed, 19 Oct 2022 05:16:05 GMT

Help! I have been working on this for the last week and I went to complete my home page for the experience today and this happened. I now can't see my pages in the Contents pane, and I can't edit this one with the Contents Pane editor options. I'm freaking out... what do I do? I have a presentation next Wednesday and was hoping to showcase this.

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

TonghuiMing — Wed, 19 Oct 2022 05:42:22 GMT

Is it possible to share your app in some way for us to take a look?

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

OLIVIALUNSFORD — Wed, 19 Oct 2022 06:40:39 GMT

Here is the experience. I was working on the "Need To Know" Page when this happened. I was going to implement hover cards with descriptions for project phases that the user will see on the second page.

But I literally can't even access the Pages section of ExB to delete or add Pages anymore. I was going to delete this one and just start over because of the error, but there's no way to back track.

https://experience.arcgis.com/experience/c0c1005cec73457196d5c2b665d134f6/page/Need-to-Know/?draft=true

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

TonghuiMing — Wed, 19 Oct 2022 07:16:23 GMT

I cannot access it unfortunately

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

OLIVIALUNSFORD — Wed, 19 Oct 2022 07:20:22 GMT

Sorry - give it a try now.

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

TonghuiMing — Wed, 19 Oct 2022 07:46:46 GMT

I can see it now and we will take a look at it. In the meantime, it would be helpful if no further savings are done. Thanks for bringing it up.

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

TonghuiMing — Wed, 19 Oct 2022 09:34:00 GMT

Hello @OLIVIALUNSFORD -

After checking, the widget causing the problem has been identified, but we are not sure what configurations had been done prior to this - it is quite weird and probably needs certain specific pre-steps.

The good news is - there is a way for you to resolve this issue on your end.

1. In the builder canvas, select 'Card 2', and then delete it:

2. Save the app and then refresh the browser. It should look fine now.

All you have to do now is to add another Card widget as a replacement and continue building the app.

Thank you,

Tonghui

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

OLIVIALUNSFORD — Wed, 19 Oct 2022 16:24:02 GMT

That worked! THANK YOU!

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

Laura — Wed, 10 Jul 2024 15:43:14 GMT

I am having this issue with the search widget - after it was previously working. When I try to add an action is pops up with that error.

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

TonghuiMing — Thu, 11 Jul 2024 03:14:56 GMT

@Laura Which environment and version are you using? If it's AGOL, can you share the app with us to take a look at? Thanks.

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

Laura — Thu, 11 Jul 2024 13:10:54 GMT

I had to remove and re add the widget to fix it. I've run into this same issue before. Starts to get annoying if you have a highly configured widget.

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

MariaAngelicaPrieto — Thu, 01 Aug 2024 22:08:36 GMT

Hi! I have the same issue. How do you know which widget is causing the problem?

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

elpinguino — Sat, 01 Mar 2025 23:01:35 GMT

Hello, I've also run into the same problem with the table widget using a view layer.

I deleted the table widget and put it back in. That fixed it. I had already configured/customised two other tabs in the table already which wasn't quick, so if there's a way for this bug to get ironed out that would be great.

Really appreciate the upgrades you guys have made so far in Experience Builder. It's come a long way since I started using it 2-3 years ago!

Re: HELP! Error Message "Cannot read properties of undefined (reading 'type')"

GrantHoward1 — Fri, 05 Sep 2025 17:40:13 GMT

is there an ArcGIS Idea for this fix?
Or is this fix at least on the roadmap for ESRI?
It's very inconvenient and time consuming to have to rebuilt an entire widget from scratch every time you want to make a small enhancement to it.