这个问题涉及到Akka Persistence在版本2.6.0之前使用的Java ArrayListSerializer在新版本中被移除。为了解决这个问题，需要更新旧的ArrayListSerializer来兼容新版本的Scala。该问题可通过以下步骤进行解决：

1.下载或复制以下代码，并将其添加到项目中：

object ScalaListSerializer {
  def serializerFor(system: ExtendedActorSystem): Serializer = new ScalaListSerializer
}

class ScalaListSerializer extends SerializerWithStringManifest {
  override def identifier: Int = 9001

  final val ListManifest = "L"

  override def manifest(o: AnyRef): String = o match {
    case _: List[_] => ListManifest
  }

  override def toBinary(o: AnyRef): Array[Byte] = o match {
    case l: List[_] => l.map(e => {
      val bos = new ByteArrayOutputStream()
      val out = new ObjectOutputStream(bos)
      out.writeObject(e)
      out.close()
      bos.toByteArray
    }).toArray.flatten
    case other => throw new IllegalArgumentException(s"Can't serialize object of type ${other.getClass}!")
  }

  override def fromBinary(bytes: Array[Byte], manifest: String): AnyRef = manifest match {
    case ListManifest =>
      bytes.grouped(4).map(arr => {
        val bis = new ByteArrayInputStream(arr)
        val in = new ObjectInputStream(bis)
        in.readObject()
      }).toList
    case other => throw new IllegalArgumentException(s"Unknown manifest: $other!")
  }
}

2.在Akka配置文件application.conf中，将以下行添加到底部：

akka.actor.serialization-bindings {
  "scala.collection.immutable.List" = ScalaListSerializer
}

这将绑定新的ScalaListSerializer在序列化scala.collection.immutable.List对象时使用。

3.重新编译和运行项目，Scala List对象将能够正确序列化和反序列化。

值得注意的是，如果项目中使用的是其他类型（如