Cannot Log In to Edge UI: "There was an error on the backend. Please try again."

[jurgengrech]

On a fresh installation of 4.18.01 (and also tested on a fresh installation of 4.18.05), i'm having issues logging in to Edge UI with below error:

utils.UiException: Internal Error at utils.UiException.makeExceptionWithSteps(UiException.java:40) at controllers.NonSecure.authenticate(NonSecure.java:167) at router.Routes$anonfun$routes$1$anonfun$applyOrElse$23$anonfun$apply$23.apply(Routes.scala:2819) at router.Routes$anonfun$routes$1$anonfun$applyOrElse$23$anonfun$apply$23.apply(Routes.scala:2819) at play.core.routing.HandlerInvokerFactory$anon$5.resultCall(HandlerInvoker.scala:139) at play.core.routing.HandlerInvokerFactory$JavaActionInvokerFactory$anon$14$anon$3$anon$1.invocation(HandlerInvoker.scala:127) at play.core.j.JavaAction$anon$1.call(JavaAction.scala:70) at play.http.DefaultHttpRequestHandler$1.call(DefaultHttpRequestHandler.java:20) at actions.ForceHttps.call(ForceHttps.java:29) at play.core.j.JavaAction$anonfun$7.apply(JavaAction.scala:94) at play.core.j.JavaAction$anonfun$7.apply(JavaAction.scala:94) at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24) at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24) at play.core.j.HttpExecutionContext$anon$2.run(HttpExecutionContext.scala:40) at play.api.libs.iteratee.Execution$trampoline$.execute(Execution.scala:70) at play.core.j.HttpExecutionContext.execute(HttpExecutionContext.scala:32) at scala.concurrent.impl.Future$.apply(Future.scala:31) at scala.concurrent.Future$.apply(Future.scala:492) at play.core.j.JavaAction.apply(JavaAction.scala:94) at play.api.mvc.Action$anonfun$apply$1$anonfun$apply$4$anonfun$apply$5.apply(Action.scala:105) at play.api.mvc.Action$anonfun$apply$1$anonfun$apply$4$anonfun$apply$5.apply(Action.scala:105) at play.utils.Threads$.withContextClassLoader(Threads.scala:21) at play.api.mvc.Action$anonfun$apply$1$anonfun$apply$4.apply(Action.scala:104) at play.api.mvc.Action$anonfun$apply$1$anonfun$apply$4.apply(Action.scala:103) at scala.Option.map(Option.scala:146) at play.api.mvc.Action$anonfun$apply$1.apply(Action.scala:103) at play.api.mvc.Action$anonfun$apply$1.apply(Action.scala:96) at play.api.libs.iteratee.Iteratee$anonfun$mapM$1.apply(Iteratee.scala:524) at play.api.libs.iteratee.Iteratee$anonfun$mapM$1.apply(Iteratee.scala:524) at play.api.libs.iteratee.Iteratee$anonfun$flatMapM$1.apply(Iteratee.scala:560) at play.api.libs.iteratee.Iteratee$anonfun$flatMapM$1.apply(Iteratee.scala:560) at play.api.libs.iteratee.Iteratee$anonfun$flatMap$1$anonfun$apply$14.apply(Iteratee.scala:537) at play.api.libs.iteratee.Iteratee$anonfun$flatMap$1$anonfun$apply$14.apply(Iteratee.scala:537) at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24) at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24) at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40) at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397) at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) Caused by: java.lang.ExceptionInInitializerError at controllers.Secure.getSystemResourceUrlBuilder(Secure.java:315) at controllers.NonSecure.supportsAuthenticateAndGetExpiry(NonSecure.java:793) at controllers.NonSecure.gatewayAuthenticateAndGetResponse(NonSecure.java:807) at controllers.NonSecure.authenticate(NonSecure.java:115) ... 39 more Caused by: org.apache.commons.codec.DecoderException: Illegal hexadecimal character W at index 0 at org.apache.commons.codec.binary.Hex.toDigit(Hex.java:178) at org.apache.commons.codec.binary.Hex.decodeHex(Hex.java:89) at play.api.libs.Codecs$.hexStringToByte(Codecs.scala:50) at play.api.libs.Crypto.decryptAESVersion0(Crypto.scala:521) at play.api.libs.Crypto.decryptAES(Crypto.scala:497) at play.api.libs.Crypto.decryptAES(Crypto.scala:474) at play.libs.Crypto.decryptAES(Crypto.java:179) at utils.SetupHelper.decrypt(SetupHelper.java:14) at utils.SetupHelper.user(SetupHelper.java:21) at services.ConfigService$Management.<clinit>(ConfigService.java:49)