java.lang.NullPointerException: null

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nulljava.lang.Exception: Exception raised on argument generation.> Exception: java.lang.NullPointerException: null
java.lang.NullPointerException: null	at org.scalacheck.Gen$$anonfun$frequency$1.apply(Gen.scala:292)	at org.scalacheck.Gen$$anonfun$frequency$1.apply(Gen.scala:291)	at org.scalacheck.Gen$$anonfun$flatMap$1$$anonfun$apply$21.apply(Gen.scala:115)	at org.scalacheck.Gen$$anonfun$flatMap$1$$anonfun$apply$21.apply(Gen.scala:114)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:114)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:113)	at org.scalacheck.Gen$$anon$3.apply(Gen.scala:225)	at org.scalacheck.Gen$$anonfun$sequence$1.apply(Gen.scala:241)	at org.scalacheck.Gen$$anonfun$sequence$1.apply(Gen.scala:237)	at org.scalacheck.Gen$$anon$3.apply(Gen.scala:225)	at org.scalacheck.Gen$$anonfun$filter$1.apply(Gen.scala:119)	at org.scalacheck.Gen$$anonfun$filter$1.apply(Gen.scala:118)	at org.scalacheck.Gen$$anon$3.apply(Gen.scala:225)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:114)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:113)	at org.scalacheck.Gen$$anon$3.apply(Gen.scala:225)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:114)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:113)	at org.scalacheck.Gen$$anon$3.apply(Gen.scala:225)	at org.scalacheck.Gen$$anonfun$flatMap$1$$anonfun$apply$21.apply(Gen.scala:115)	at org.scalacheck.Gen$$anonfun$flatMap$1$$anonfun$apply$21.apply(Gen.scala:114)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:114)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:113)	at org.scalacheck.Gen$$anon$3.apply(Gen.scala:225)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:114)	at org.scalacheck.Gen$$anonfun$flatMap$1.apply(Gen.scala:113)	at org.scalacheck.Gen$$anon$3.apply(Gen.scala:225)	at org.scalacheck.Prop$$anonfun$forAllShrink$1.apply(Prop.scala:566)	at org.scalacheck.Prop$$anonfun$forAllShrink$1.apply(Prop.scala:542)	at org.scalacheck.Prop$$anon$1.apply(Prop.scala:283)	at org.scalacheck.Test$$anonfun$worker$1$1$$anonfun$apply$2.apply(Test.scala:300)	at org.scalacheck.Test$$anonfun$worker$1$1$$anonfun$apply$2.apply(Test.scala:300)	at org.scalacheck.Test$.org$scalacheck$Test$$secure(Test.scala:203)	at org.scalacheck.Test$$anonfun$worker$1$1.apply(Test.scala:300)	at org.scalacheck.Test$$anonfun$worker$1$1.apply(Test.scala:291)