java.lang.OutOfMemoryError: Java heap space

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java.lang.OutOfMemoryError: Java heap space
at scalaz.DList$.fromList(DList.scala:78)
at scalaz.std.ListInstances$$anon$1.traverseImpl(List.scala:66)
at scalaz.std.ListInstances$$anon$1.traverseImpl(List.scala:14)
at scalaz.Traverse$Traversal.run(Traverse.scala:50)
at scalaz.Traverse$class.sequence(Traverse.scala:101)
at scalaz.std.ListInstances$$anon$1.sequence(List.scala:14)
at scalaz.syntax.TraverseOps.sequence(TraverseSyntax.scala:27)
at uk.gov.nationalarchives.csv.validator.AllErrorsMetaDataValidator$class.rulesForCell(AllErrorsMetaDataValidator.scala:62)
at uk.gov.nationalarchives.csv.validator.api.CsvValidator$$anon$2.rulesForCell(CsvValidator.scala:32)
at uk.gov.nationalarchives.csv.validator.MetaDataValidator$class.validateCell(MetaDataValidator.scala:275)
at uk.gov.nationalarchives.csv.validator.api.CsvValidator$$anon$2.validateCell(CsvValidator.scala:32)
at uk.gov.nationalarchives.csv.validator.AllErrorsMetaDataValidator$$anonfun$1.apply(AllErrorsMetaDataValidator.scala:44)
at uk.gov.nationalarchives.csv.validator.AllErrorsMetaDataValidator$$anonfun$1.apply(AllErrorsMetaDataValidator.scala:42)
at uk.gov.nationalarchives.csv.validator.AllErrorsMetaDataValidator$class.rules(AllErrorsMetaDataValidator.scala:42)
at uk.gov.nationalarchives.csv.validator.api.CsvValidator$$anon$2.rules(CsvValidator.scala:32)
at uk.gov.nationalarchives.csv.validator.MetaDataValidator$class.validateRow(MetaDataValidator.scala:235)
at uk.gov.nationalarchives.csv.validator.api.CsvValidator$$anon$2.validateRow(CsvValidator.scala:32)
at uk.gov.nationalarchives.csv.validator.AllErrorsMetaDataValidator$class.validateRows$1(AllErrorsMetaDataValidator.scala:30)
at uk.gov.nationalarchives.csv.validator.AllErrorsMetaDataValidator$class.validateRows(AllErrorsMetaDataValidator.scala:35)
at uk.gov.nationalarchives.csv.validator.api.CsvValidator$$anon$2.validateRows(CsvValidator.scala:32)
at uk.gov.nationalarchives.csv.validator.MetaDataValidator$$anonfun$11.apply(MetaDataValidator.scala:186)
at uk.gov.nationalarchives.csv.validator.MetaDataValidator$$anonfun$11.apply(MetaDataValidator.scala:150)
at resource.AbstractManagedResource$$anonfun$5.apply(AbstractManagedResource.scala:86)
at scala.util.control.Exception$Catch$$anonfun$either$1.apply(Exception.scala:125)
at scala.util.control.Exception$Catch$$anonfun$either$1.apply(Exception.scala:125)
at scala.util.control.Exception$Catch.apply(Exception.scala:103)
at resource.AbstractManagedResource.acquireFor(AbstractManagedResource.scala:86)
at resource.DeferredExtractableManagedResource.either(AbstractManagedResource.scala:29)
at uk.gov.nationalarchives.csv.validator.MetaDataValidator$class.validateKnownRows(MetaDataValidator.scala:189)
at uk.gov.nationalarchives.csv.validator.api.CsvValidator$$anon$2.validateKnownRows(CsvValidator.scala:32)

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