Currently using Sitecore.NET 10.2.0 (rev. 006766) I am getting issues related to form in the Form builder. Getting below error in console

Uncaught TypeError: Cannot set properties of undefined (setting 'IsDisabled')
    at Object.loadFormCompleted (FormDesigner.js:304:74)
    at triggerEvents (sitecore.js:1479:43)
    at Object.trigger (sitecore.js:1626:13)
    at Object.loadFormSuccess (FormDesignBoard.js:169:22)
    at Object.<anonymous> (jquery-2.1.1.js:3230:33)
    at fire (jquery-2.1.1.js:3073:30)
    at Object.fireWith [as resolveWith] (jquery-2.1.1.js:3185:7)
    at done (jquery-2.1.1.js:8251:14)
    at XMLHttpRequest.<anonymous> (jquery-2.1.1.js:8598:9)

Also, a few images in not loading See in the attached screenshot

Console Errorenter image description here

What should I do to resolve this error and what should we need check configuration for same issue

  • OP: I'm getting the same error. Did you ever find a solution? To people complaining about me posting this as an answer instead of a comment. I can't: You must have 50 reputation to comment
    – user13783
    Oct 17 at 13:54
  • Does the issue still occur in a private browsing tab? Do the Sitecore logs say anything? Do you have any custom code related to Sitecore Forms? Does it happen on all forms? What if you create a new one? Oct 17 at 14:35

1 Answer 1


I tried same thing in Sitecore.NET 10.2.0 (rev. 006766) vanilla instance and I am not getting any issue. You can try below approaches.

  1. Can you please make sure you have all scripts as shown in below screenshot on the following path your_Root\sitecore modules\Web\ExperienceForms\scripts

enter image description here

  1. Comments out custom JS files because they also conflict with OOTB JS files in Sitecore.

Hope this will help you.

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