Java Play 2.7 "CreationException: Unable to create injector:"

[AminMkh]

I'm getting this error:

scalaVersion := "2.12.8"

$ java -version:
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)

Unexpected exception

CreationException: Unable to create injector, see the following errors:

1) Error injecting constructor, errors.ObjectNotFoundException: No enum found
  at service.UnitsService.<init>(UnitsService.java:34)
  at service.UnitsService.class(UnitsService.java:34)
  while locating service.UnitsService
    for field at controllers.UnitsController.unitsServce(UnitsController.java:33)
  while locating controllers.UnitsController
    for the 7th parameter of router.Routes.<init>(Routes.scala:66)
  while locating router.Routes
  while locating play.api.inject.RoutesProvider
  while locating play.api.routing.Router
    for the 2nd parameter of play.modules.swagger.SwaggerPluginImpl.<init>(SwaggerPlugin.scala:35)
  while locating play.modules.swagger.SwaggerPluginImpl
  at play.modules.swagger.SwaggerModule.bindings(SwaggerModule.scala:11):
Binding(interface play.modules.swagger.SwaggerPlugin to ConstructionTarget(class play.modules.swagger.SwaggerPluginImpl) eagerly) (via modules: com.google.inject.util.Modules$OverrideModule -> play.api.inject.guice.GuiceableModuleConversions$$anon$4)
  while locating play.modules.swagger.SwaggerPlugin

1 error
No source available, here is the exception stack trace:

->com.google.inject.CreationException: Unable to create injector, see the following errors:

1) Error injecting constructor, errors.ObjectNotFoundException: No enum found
  at service.UnitsService.<init>(UnitsService.java:34)
  at service.UnitsService.class(UnitsService.java:34)
  while locating service.UnitsService
    for field at controllers.UnitsController.unitsServce(UnitsController.java:33)
  while locating controllers.UnitsController
    for the 7th parameter of router.Routes.<init>(Routes.scala:66)
  while locating router.Routes
  while locating play.api.inject.RoutesProvider
  while locating play.api.routing.Router
    for the 2nd parameter of play.modules.swagger.SwaggerPluginImpl.<init>(SwaggerPlugin.scala:35)
  while locating play.modules.swagger.SwaggerPluginImpl
  at play.modules.swagger.SwaggerModule.bindings(SwaggerModule.scala:11):
Binding(interface play.modules.swagger.SwaggerPlugin to ConstructionTarget(class play.modules.swagger.SwaggerPluginImpl) eagerly) (via modules: com.google.inject.util.Modules$OverrideModule -> play.api.inject.guice.GuiceableModuleConversions$$anon$4)
  while locating play.modules.swagger.SwaggerPlugin

1 error

     com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:543)

     com.google.inject.internal.InternalInjectorCreator.injectDynamically(InternalInjectorCreator.java:186)

     com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:109)

     com.google.inject.Guice.createInjector(Guice.java:87)

     com.google.inject.Guice.createInjector(Guice.java:78)

     play.api.inject.guice.GuiceBuilder.injector(GuiceInjectorBuilder.scala:201)

     play.api.inject.guice.GuiceApplicationBuilder.build(GuiceApplicationBuilder.scala:156)

     play.api.inject.guice.GuiceApplicationLoader.load(GuiceApplicationLoader.scala:22)

     play.core.server.DevServerStart$$anon$1.$anonfun$reload$3(DevServerStart.scala:193)

     play.utils.Threads$.withContextClassLoader(Threads.scala:22)

     play.core.server.DevServerStart$$anon$1.reload(DevServerStart.scala:185)

     play.core.server.DevServerStart$$anon$1.get(DevServerStart.scala:144)

     play.core.server.ssl.ServerSSLEngine$.createSSLEngineProvider(ServerSSLEngine.scala:34)

     play.core.server.AkkaHttpServer$$anon$2$$anon$3.sslEngineProvider$lzycompute(AkkaHttpServer.scala:534)

     play.core.server.AkkaHttpServer$$anon$2$$anon$3.sslEngineProvider(AkkaHttpServer.scala:533)

     play.core.server.AkkaHttpServer$$anon$2$$anon$3.engineCreateSSLEngine(AkkaHttpServer.scala:535)

     javax.net.ssl.SSLContext.createSSLEngine(SSLContext.java:329)

     akka.stream.scaladsl.TLS$.$anonfun$apply$2(TLS.scala:91)

     akka.stream.impl.io.TLSActor.liftedTree1$1(TLSActor.scala:159)

     akka.stream.impl.io.TLSActor.<init>(TLSActor.scala:159)

     akka.stream.impl.io.TLSActor$.$anonfun$props$1(TLSActor.scala:38)

     akka.actor.TypedCreatorFunctionConsumer.produce(IndirectActorProducer.scala:91)

     akka.actor.Props.newActor(Props.scala:212)

     akka.actor.ActorCell.newActor(ActorCell.scala:648)

     akka.actor.ActorCell.create(ActorCell.scala:674)

     akka.actor.ActorCell.invokeAll$1(ActorCell.scala:547)

     akka.actor.ActorCell.systemInvoke(ActorCell.scala:569)

     akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:293)

     akka.dispatch.Mailbox.run(Mailbox.scala:228)

     akka.dispatch.Mailbox.exec(Mailbox.scala:241)

     akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)

     akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)

     akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)

     akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)