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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This makes your code much more readable.
You will have to add code that checks whether the result is a valid user.