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  1. ,
    Expert tip

    You need to add httpcore to your dependencies. Try adding version 4.3 or further.

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    A few things cause this exception:
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via GitHub by chris-martin
, 1 year ago
akka.actor.MissingExtension
java.lang.ClassNotFoundException: akka.actor.MissingExtension	at java.lang.ClassLoader.findClass(ClassLoader.java:530)	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)	at sbt.classpath.ClasspathFilter.loadClass(ClassLoaders.scala:59)	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:348)	at akka.actor.ReflectiveDynamicAccess$$anonfun$getClassFor$1.apply(ReflectiveDynamicAccess.scala:21)	at akka.actor.ReflectiveDynamicAccess$$anonfun$getClassFor$1.apply(ReflectiveDynamicAccess.scala:20)	at scala.util.Try$.apply(Try.scala:192)	at akka.actor.ReflectiveDynamicAccess.getClassFor(ReflectiveDynamicAccess.scala:20)	at akka.actor.ReflectiveDynamicAccess.createInstanceFor(ReflectiveDynamicAccess.scala:38)	at akka.actor.ActorSystemImpl$$anonfun$loadExtensions$1$1$$anonfun$1.applyOrElse(ActorSystem.scala:769)	at akka.actor.ActorSystemImpl$$anonfun$loadExtensions$1$1$$anonfun$1.applyOrElse(ActorSystem.scala:769)