A null value was provided in a named collection (dictionary) of InstanceValues. The name provided for the null value was ...

A null value was provided in a named collection (dictionary) of InstanceValues. The name provided for the null value was {0}. Null is not a valid InstanceValue. To specify a null value, use an instance of InstanceValue with null data by passing null to the InstanceValue constructor. To indicate that a named value should be deleted, use InstanceValue.DeletedValue.