My guess here is that there is a null value for the CreatedDate field of the directory you're importing:
not-null property references a null or transient value: com.atlassian.crowd.model.directory.DirectoryImpl.createdDate
It looks like you're importing a crowd 2.4.2 backuop. Are you importing this to another 2.4.2 instance? Ensure that you are performing the import into the same version of Crowd that it came from. Or, upgrade the original instance and perform a new export.
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