java.util.NoSuchElementException: None.get

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java.util.NoSuchElementException: None.get
at scala.None$.get(Option.scala:347)
at scala.None$.get(Option.scala:345)
at chisel3.internal.HasId$class.getRef(Builder.scala:88)
at chisel3.core.Data.getRef(Data.scala:30)
at chisel3.internal.firrtl.Node.fullName(IR.scala:53)
at chisel3.internal.firrtl.Emitter.chisel3$internal$firrtl$Emitter$$emit(Emitter.scala:26)
at chisel3.internal.firrtl.Emitter$$anonfun$moduleDefn$1$$anonfun$apply$mcV$sp$2.apply(Emitter.scala:76)
at chisel3.internal.firrtl.Emitter$$anonfun$moduleDefn$1$$anonfun$apply$mcV$sp$2.apply(Emitter.scala:70)

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