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PowerApps - Portal - Yellow Screen of Death (YSOD)

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Posted on by Community Power Pla... Microsoft Employee

Getting this strange error message (see attachment) and I can't seem to find anything about it anywhere. I am trying to use a form that I built with Entity Permissions and even when I remove the permissions, I get a different error.

Server Error in '/' Application.

Class ID doesn't match any known Boolean control.
Parameter name: f9a8a302-114e-466a-b582-6771b2ae0d92

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentNullException: Class ID doesn't match any known Boolean control.
Parameter name: f9a8a302-114e-466a-b582-6771b2ae0d92

Hopefully someone can assist with this.

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Power Apps portals

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v-siky-msft Microsoft Employee on at

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Hi @Anonymous ,

From this article, we can know that the ClassID refers to control class ID.
Please go to check if there is any custom control on the Entity Form?
I also suggest you create a new simple Entity Form without any custom controls to try again and see if the YSOD errors fixed.
Sik

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Community Power Pla... Microsoft Employee on at

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I found that there are some custom controls that were created on the form. These are yes no toggles. What is the next step that I need to take to resolve the error message?

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v-siky-msft Microsoft Employee on at

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Hi @Anonymous

Could you please try this to check if the error is fixed?
1. create a new Form without any custom control
2. deactivate the previous Entity Form, and apply the new Form to Portal
Sik

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v-siky-msft Microsoft Employee on at

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Hi @Anonymous ,

Has your issue been resolved?
Feel free to post back if there are any problems.
Sik

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Logix365 14 on at

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I came across this error today and found it to be caused by a Two Option field that was added to the form which had a custom control, "Toggle Swtich". After removing the custom control from the Two Option field my forms are now working.

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