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enum ListError.Reason (v201809)

The reason for the error.

Enumeration Description
CLEAR_UNSUPPORTED A request attempted to clear a list that does not support being cleared.
INVALID_OPERATOR The operator is invalid for the list or list element the operator was applied to.
INVALID_ELEMENT An UPDATE or REMOVE was requested for a list element that does not exist.
LIST_LENGTH_MISMATCH The operator list has different a size compared to the element list.
DUPLICATE_ELEMENT Duplicate elements inside list.
MUTATE_UNSUPPORTED The API operator of the mutate being performed on the entity containing this list is not supported.