Getting Appian Object Error

While Adding a user in user picker, I am getting the following error :-

Expression evaluation error [evaluation ID = X04FSPY0] in rule 'ugm_userpickersinglecell' (called by rules 'ugm_groupmembershipsinglerowlayout' > 'ugm_int_manageusermembershipforgroupsgrid' > 'ugm_form_managegroupmembership') at function a!applyComponents [line 13]: Appian object error. Details: Failed to execute query in thread for: EngineBackedQueryExecutor [queryKey=PERSONALIZATION, typeIds=[5, 41, 4], transformTypeIds=[5, 41, 4], refClasses=[class com.appiancorp.type.refs.GroupRefImpl, class com.appiancorp.type.refs.GroupTypeRefImpl, class com.appiancorp.type.refs.UserRefImpl], reducedExecutor=[ReducedExecutor personalization-extended-group-service:Group,Group Type,User]]

Can someone please help in identifying the root cause of this error.

Thanks in advance.

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