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我正在使用avro4s

https://github.com/sksamuel/avro4s

我写了这段代码

  import java.io.ByteArrayOutputStream
  import com.sksamuel.avro4s._

  sealed trait Dibble
  case class Dobble(str: String) extends Dibble
  case class Dabble(dbl: Double) extends Dibble

  case class Drapper(dibble: Dibble)

  val drapperIn = Drapper(Dabble(2.0))
  val bios = new ByteArrayOutputStream
  val avro = AvroOutputStream.binary[Drapper](bios)
  avro.write(drapperIn)
  avro.close()

  val is = AvroInputStream.binary[Drapper](bios.toByteArray)
  val drapperOut = is.iterator().toList.head
  is.close()

  println(drapperIn == drapperOut)

但是读取二进制数据时出现以下错误

错误：(18, 47) 找不到类型为 com.sksamuel.avro4s.FromRecord[A$A449.this.Drapper] 的证据参数的隐式值，惰性值 = AvroInputStream.binaryDrapper ^ 错误：(18, 47) 不够方法二进制的参数：（隐含证据$13：com.sksamuel.avro4s.SchemaFor[A$A449.this.Drapper]，隐含证据$14：com.sksamuel.avro4s.FromRecord[A$A449.this.Drapper]）com。 sksamuel.avro4s.AvroBinaryInputStream[A$A449.this.Drapper]。未指定值参数证据 $14。惰性值是 = AvroInputStream.binaryDrapper ^

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