Hi,
I am getting above error while selecting user for task assignment on the interface.
a!pickerFieldUsersAndGroups( value: rule!<rulename>( fv!item.Assignee ),
Rule code
if( rule!APN_isBlank( ri!userOrGroup ), null, if( charat( tostring( ri!userOrGroup ), 1 ) = "[", togroup( ri!userOrGroup ), touser( ri!userOrGroup ) ))
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The error occurs because some values in fv!item.Assignee are not valid Appian usernames or group names. Your code is correct, But invalid or extra characters in the data cause this issue.Validate username and Group before passing it to pickerField.