java.lang.ExceptionInInitializerError error when parsing json - scala

Question

For this class
case class AnswerOfAPracticeQuestion (question_id: UUID,
image: Option[List[String]],
notes: Option[String],
answer:List[AnswerSection],
answer_id:Option[UUID],
answeredBy: Option[Answerer],
creationYear:Option[Long],
creationMonth:Option[Long],
){
}
the Reads method fails when I send this json to it
{
"new-answer":{
"images":[
"image 1",
"image 2"
],
"notes":"some notes",
"answer":[
{
"filename":"f1",
"answer":"a1"
},
{
"filename":"f2",
"answer":"a2"
}
],
"answer-id":"11111111-1111-1111-1111-111111111112",
"question-id":"11111111-1111-1111-1111-111111111111",
"creator-id":"11111111-1111-1111-1111-111111111113"
}
}
Reads method is
implicit val answerOfAPracticeQuestionReads: Reads[AnswerOfAPracticeQuestion] = (
(JsPath \ "question-id").read[UUID] and
(JsPath \ "images").readNullable[List[String]] and
(JsPath \ "notes").readNullable[String] and
(JsPath \ "answer").read[List[AnswerSection]] and //FAILS FOR THIS LINE
(JsPath \ "answer-id").readNullable[UUID] and
(JsPath \ "answerer").readNullable[Answerer] and
(JsPath \ "creation-year").readNullable[Long] and //year/month are for internal consumption so not worried about receiving it from a client
(JsPath \ "creation-month").readNullable[Long]
)(AnswerOfAPracticeQuestion.apply _)
Reads for AnswerSection is
implicit val answerSectionReads:Reads[AnswerSection] = (
(JsPath \ "filename").read[String] and
(JsPath \ "answer").read[String]
)(AnswerSection.apply _)
The error is
java.lang.ExceptionInInitializerError
at models.AnswerImplicits$.<init>(Answers.scala:92)
at models.AnswerImplicits$.<clinit>(Answers.scala)
at models.AnswerImplicits$AnswerAPIReads$.reads(Answers.scala:108)
at play.api.libs.json.ConstraintReads.$anonfun$optionWithNull$1(JsConstraints.scala:110)
at play.api.libs.json.Reads$$anon$8.reads(Reads.scala:132)
at play.api.libs.json.JsLookupResult.validateOpt(JsLookup.scala:164)
at play.api.libs.json.JsLookupResult.validateOpt$(JsLookup.scala:162)
at play.api.libs.json.JsDefined.validateOpt(JsLookup.scala:176)
at play.api.libs.json.JsValue.validateOpt(JsValue.scala:20)
at play.api.libs.json.JsValue.validateOpt$(JsValue.scala:19)
at play.api.libs.json.JsObject.validateOpt(JsValue.scala:124)
at controllers.AnswerController.$anonfun$newAnswer$1(AnswerController.scala:399)
at com.mohiva.play.silhouette.api.actions.SecuredActionBuilder.$anonfun$invokeBlock$8(SecuredAction.scala:216)
at com.mohiva.play.silhouette.api.actions.SecuredRequestHandlerBuilder.$anonfun$invokeBlock$2(SecuredAction.scala:93)
at com.mohiva.play.silhouette.api.RequestHandlerBuilder.handleInitializedAuthenticator(RequestHandler.scala:169)
at com.mohiva.play.silhouette.api.RequestHandlerBuilder.handleBlock(RequestHandler.scala:119)
at com.mohiva.play.silhouette.api.RequestHandlerBuilder.handleBlock$(RequestHandler.scala:117)
at com.mohiva.play.silhouette.api.actions.SecuredRequestHandlerBuilder.handleBlock(SecuredAction.scala:52)
at com.mohiva.play.silhouette.api.actions.SecuredRequestHandlerBuilder.$anonfun$invokeBlock$1(SecuredAction.scala:93)
at scala.concurrent.Future.$anonfun$flatMap$1(Future.scala:302)
at scala.concurrent.impl.Promise.$anonfun$transformWith$1(Promise.scala:37)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:60)
at scala.concurrent.impl.ExecutionContextImpl$AdaptedForkJoinTask.exec(ExecutionContextImpl.scala:140)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.pollAndExecAll(ForkJoinPool.java:1021)
at java.util.concurrent.ForkJoinPool$WorkQueue.execLocalTasks(ForkJoinPool.java:1046)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1058)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Caused by: scala.UninitializedFieldError: Uninitialized field: C:\Users\manuc\Documents\manu\codingjedi\code_related\code\frontend\web\app\models\Answers.scala: 196
at models.AnswerImplicits$.answerOfAPracticeQuestionWrites(Answers.scala:196)
at models.PracticeQuestionImplicits$.<init>(PracticeQuestion.scala:139)
at models.PracticeQuestionImplicits$.<clinit>(PracticeQuestion.scala)
... 29 more
Futures timed out after [5000 milliseconds]
java.util.concurrent.TimeoutException: Futures timed out after [5000 milliseconds]
...
If I compare the implicit methods, in the pics below, you'll notice that the reads, there is an additional canBuildForm while there is nothing like it in writes
Reads
Writes