Error when editing and viewing forms - MDA (across different apps, env, tenants and browsers)

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Posted on by Mattb-Motive

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When editing forms in a model-driven app, quite often an error message appears on the form (the form is blank and can't be clicked) stating: "Error Something went wrong".

The only resolution appears to be to refresh the browser, losing any changes made since the last save point. It can happen at any point of editing a form and doesn't seem to have a pattern to it.

This is happening on forms for both out-of-the-box tables (account, contact) and custom tables.

Looks to be a similar issue as this Reddit forum post: https://www.reddit.com/r/Dynamics365/comments/1iy5rr9/something_went_wrong_popup_every_time_i_try_to/?rdt=45398

Has anyone else experienced this? Any tips to resolve?

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gulshankhurana 1,397 Moderator on at

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Hi

What does it say when you click on 'Show Details'? For any troubleshooting, it helps if the error log is available.

Kind regards

Gulshan

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Mattb-Motive 195 on at

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Hi @gulshankhurana

Unfortunately, none of the buttons or links on the dialogue box are clickable. So, it's not possible to see the error log. The only action you can take is clicking the browser's back arrow or refreshing the browser.

It's like the error is happening in the preview of the form.

Will try to see if Developer Tools shows anything.

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Mattb-Motive 195 on at

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A similar looking error appeared when using the app (although I can't be 100% sure it's the same error).

EDIT: This doesn't seem to be the same error that is happening when editing the form (see other reply)

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Timestamp: Fri Mar 14 2025 09:49:06 GMT+1000 (Australian Eastern Standard Time)

Cannot read properties of undefined (reading 'indexOf')
TypeError: Cannot read properties of undefined (reading 'indexOf') at String._toFormattedString (https://content.powerapps.com/resource/uci-infra-web/scripts/MicrosoftAjax.0e42282974e6a0c11842f769c467f9c3.js:1:7849) at String.format (https://content.powerapps.com/resource/uci-infra-web/scripts/MicrosoftAjax.0e42282974e6a0c11842f769c467f9c3.js:1:7740) at https://content.powerapps.com/resource/uci-infra-web/scripts/app.bb76892840fe460a89e5468818b8a340.js:4:52950 at Array.map (<anonymous>) at https://content.powerapps.com/resource/uci-infra-web/scripts/app.bb76892840fe460a89e5468818b8a340.js:4:52872 at r.mapToProps (https://content.powerapps.com/resource/uci-infra-web/scripts/editformpage.f1a045337e918ba8362a8127981dd541.js:4:478638) at r (https://content.powerapps.com/resource/uci-infra-web/scripts/vendor.41182f40158752b47658ab06a0afe6d1.js:25:31312) at r.mapToProps (https://content.powerapps.com/resource/uci-infra-web/scripts/vendor.41182f40158752b47658ab06a0afe6d1.js:25:31526) at r (https://content.powerapps.com/resource/uci-infra-web/scripts/vendor.41182f40158752b47658ab06a0afe6d1.js:25:31312) at https://content.powerapps.com/resource/uci-infra-web/scripts/vendor.41182f40158752b47658ab06a0afe6d1.js:25:32660

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Mattb-Motive 195 on at

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This is happening across multiple apps (Dynamics and Power Apps), environments, tenants and browsers. How aren't more people seeing this issue???

It's also happening while editing forms and viewing the app. So, end users could be seeing this too.

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Mattb-Motive 195 on at

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Error message from form when editing (Dataverse URL changed):

Form descriptor is null or not defined

UciError: Form descriptor is null or not defined at s (https://abc123.crm5.dynamics.com/uclient/scripts/app.js?v=1.4.9902-2502.4:33:941039) at new m (https://abc123.crm5.dynamics.com/uclient/scripts/app.js?v=1.4.9902-2502.4:28:151602) at https://abc123.crm5.dynamics.com/uclient/scripts/41.js?v=1.4.9902-2502.4:4:46385 at Object.execute (https://abc123.crm5.dynamics.com/uclient/scripts/41.js?v=1.4.9902-2502.4:4:46437) at https://abc123.crm5.dynamics.com/uclient/scripts/app.js?v=1.4.9902-2502.4:14:577517 at new Promise (<anonymous>) at w._executeAsyncAction (https://abc123.crm5.dynamics.com/uclient/scripts/app.js?v=1.4.9902-2502.4:14:577218) at w._executeAsync (https://abc123.crm5.dynamics.com/uclient/scripts/app.js?v=1.4.9902-2502.4:14:577062) at w.executeAction (https://abc123.crm5.dynamics.com/uclient/scripts/app.js?v=1.4.9902-2502.4:14:576327) at t.dispatch (https://abc123.crm5.dynamics.com/uclient/scripts/app.js?v=1.4.9902-2502.4:14:581688)

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GR-25091135-0 8 on at

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Matt

Yes we get this all the time. Seems to have only been happening in the last few months. Cannot click the link. I wonder if this is related to sign in somehow. We also get Sign In message that you cannot click on for any canvas App embedded in the model driven form. This has stopped the creation of a canvas App from the form working too. I need to create a ticket for that, but I sort of have a template and can copy that as a workaround. If you don't have an App already with the integration object, I would be interested to see if anyone else can get that working.

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GR-25091135-0 8 on at

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Matt

I have a feeling this is likely to do with JavaScript, at least in our case. I cannot find the issue but if you are using JavaScript you could take a look at this and see if it helps: https://learn.microsoft.com/en-us/power-apps/developer/model-driven-apps/troubleshoot-forms?wt.mc_id=knwlserAPI_inproduct_copilotstudio#intermittent-form-errors

G

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GR-25091135-0 8 on at

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If you go into Inspect, and set the overlay to uncheck the Position: Absolute, you can then click the links and button...!

This may give more details to help fix the issue. My issue is reporting 'Cannot read properties of undefined (reading 'indexOf')' but all references are in uclient/scripts/MicrosoftAjax.js or uclient/scripts/vendor.js, so I'm no nearer a solution. It seems to be a race condition as often will not error.

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RyanAutomates 139 on at

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Not a fix, but I'll just say my thoughts on this.

This is happening in many environments I work in at the moment also. I expect makers simply refresh, or go "back" and open the form again (like I do), waiting for Microsoft to fix it. Best thing to do is open a Microsoft ticket, but as it's not "breaking", they will take their time with it. I have a hunch it's to do with Microsoft trying to run custom enabled JavaScript web resources in the actual form editor, but not something I could look into deeply.

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MA-01071341-0 2 on at

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Hi All who have this issue

Clear your browser cache AND your cookies. This fixed it for me. Just clearing my browser cache caused a bad request error when opening the app but clearing both fixed that and this issue for me.

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