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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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!