The grid was working fine before 2 days but now started to face this issue. None of the grid is loading
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Try this,Open LIS Supplier Record Type and manually full sync.Open record type and fix list grid columns data.As i can see banner on top of your screenshot seems to be a upgrade issue please wait meanwhile appian fix it.
It is not a code issue but there seems to be an issue in the Appian Community Edition as the same error is shown in all interfaces having recordData configured as data for gridfield(). Other grid having local variables with list of record Types are working fine though!
Looks like recent upgrade has caused some issues. Suggest you to drop email to communityedition@appian.com informing them about the issue so they can look into this!
I am facing the same issue its not only at the interface layer even the record list of newly created record type is throwing same error. So it must be some upgrade issue.
In some records and interfaces I am encountering the same.