Whenever a user encounters any error in the UI, Appian shows pink box error. I do not want to show the Appian default pink box error, I want to show a custom error to the user which has no technical details. How can I achieve that in Appian?
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Well, there's already the common option (as of the last several years) wherein any error message a user sees will have all technical details replaced with a UUID they're told to report to their administrators, which you can then go and match with the matching error in the error logs. Do you have that enabled?
Otherwise, the only way to prevent pink box errors is... remove the error conditions that cause them. And (other than the above setting) there's no setting or override to show something "custom". I know it can be hard to weed out 100% in a sufficiently large system, but in most cases you should be able to keep them down to very few (and fix the ones that anyone encounters).