Membership List composite key transformation Argument Null Exception

Adapter import all entities for adapter failed.
Adapter import all entities for adapter 02dcad6e-a5d8-4b34-8650-1bb5e917ec2a failed with reason Value cannot be null.
Parameter name: generator. Duration: 00:00:48.6640625
Error details:
System.ArgumentNullException: Value cannot be null.
Parameter name: generator
at Unify.Product.IdentityBroker.MembershipListCompositeKeyEntityDistinguishedNameTransformationBase..ctor(IEntityPartitionUpdatableContextFactory rightSideEntityRepository, IDictionary`2 relationships, GroupedNameValueCollectionKey groupTarget, IEntityPartitionContextFactoryInformation rightSideFactoryInformation, IEntityDistinguishedNameGenerator`2 generator, Boolean distinctTargetGroup)
at Unify.Product.IdentityBroker.MembershipListCompositeKeyEntityDistinguishedNameTransformationFactory.CreateComponent(IAdapterEntityTransformationFactoryInformation factoryInformation)
at Unify.Product.IdentityBroker.EntitySequentialAdapterFactory.<>c__DisplayClass11.<CreateComponent>b__10(IAdapterEntityTransformationFactory innerFactory)
at System.Linq.Enumerable.WhereSelectListIterator`2.MoveNext()
at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable`1 source, TAccumulate seed, Func`3 func)
at System.Linq.Enumerable.<>c__DisplayClass12`3.<CombineSelectors>b__11(TSource x)
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at Unify.Framework.Collections.EnumerableExtensions.<ActionOnLast>d__17`1.MoveNext()
at System.Linq.Enumerable.<SelectManyIterator>d__14`2.MoveNext()
at Unify.Framework.Collections.EnumerableExtensions.<ActionOnLast>d__17`1.MoveNext()
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at Unify.Framework.Collections.ActionOnExceptionEnumerator`1.MoveNext()
at Unify.Framework.Collections.EnumerableExtensions.<ActionOnLast>d__17`1.MoveNext()
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Linq.Enumerable.<SelectManyIterator>d__14`2.MoveNext()
at System.Linq.Enumerable.<ConcatIterator>d__71`1.MoveNext()
at Unify.Framework.IO.LDIFComponentFileGenerator`1.GenerateFile(TextWriter writer, IEnumerable`1 entries)
at Unify.Product.IdentityBroker.LDIFAdapterBase.<>c__DisplayClass14`1.<CreateLDIFComponentStream>b__13(Stream stream)