Error while trying to update IAPs on google play

IAP.scala

  def update
    (pkgName: PkgName, diff: IAPDiffResult)
    (implicit log: Logger, service: AndroidPublisher) =
  {
    val iaps = service.inappproducts()

    def doUpdates() = {
      log.logln(s"Updating IAPs (${diff.changes.size})")
      diff.changes.foreach { diff =>
        val iap = diff.local
        try {
          iaps
            .patch(pkgName.s, iap.sku.s, iap.toGoogle(pkgName))
            .setAutoConvertMissingPrices(true)
            .tap(_.logDebugString)
            .execute()
        }
        catch {
          case t: Throwable => throw new Exception(s"While inserting $iap", t)
        }
      }
      log.logln(s"Updating IAPs done")
    }

    def doInserts() = {
      log.logln(s"Inserting new IAPs (${diff.inserts.size})")
      diff.inserts.foreach { iap =>
        try {
          iaps.insert(pkgName.s, iap.toGoogle(pkgName)).
            setAutoConvertMissingPrices(true).execute()
        }
        catch {
          case t: Throwable => throw new Exception(s"While inserting $iap", t)
        }
      }
      log.logln(s"Inserting new IAPs done.")
    }

    doUpdates()
    doInserts()
  }

output.txt

Fetching IAPs for PkgName(com.tinylabproductions.test)
{"defaultLanguage":"en-US","defaultPrice":{"currency":"EUR","priceMicros":"500000"},"listings":{"en-US":{"description":" ","title":"test"}},"packageName":"com.tinylabproductions.test","purchaseType":"managedUser","sku":"test","status":"active"}
Fetched IAPs for PkgName(com.tinylabproductions.test)
Updating IAPs (1)
PATCH https://www.googleapis.com/androidpublisher/v2/applications/com.tinylabproductions.test/inappproducts/test?autoConvertMissingPrices=true
Headers: 
  accept-encoding -> [gzip]
  user-agent -> [TinyLabProductions-GooglePlayUploader/1.0 Google-API-Java-Client]
Content:
{"defaultLanguage":"en-US","defaultPrice":{"currency":"EUR","priceMicros":"1000000"},"listings":{"en-US":{"description":" ","title":"test"}},"packageName":"com.tinylabproductions.test","sku":"test"}
       
Exception in thread "main" java.lang.Exception: While inserting IAP(SKU(test),€ 1.0,IAPListing(Title(test),Description( )))
	at com.tinylabproductions.google_play_uploader.actions.IAPs$$anonfun$doUpdates$1$1.apply(IAPs.scala:61)
	at com.tinylabproductions.google_play_uploader.actions.IAPs$$anonfun$doUpdates$1$1.apply(IAPs.scala:59)
	at scala.collection.Iterator$class.foreach(Iterator.scala:893)
	at scala.collection.AbstractIterator.foreach(Iterator.scala:1336)
	at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
	at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
	at com.tinylabproductions.google_play_uploader.actions.IAPs$.doUpdates$1(IAPs.scala:59)
	at com.tinylabproductions.google_play_uploader.actions.IAPs$.update(IAPs.scala:89)
	at com.tinylabproductions.google_play_uploader.actions.IAPs$.update2(IAPs.scala:116)
	at com.tinylabproductions.google_play_uploader.Main$.main(Main.scala:76)
	at com.tinylabproductions.google_play_uploader.Main.main(Main.scala)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
Caused by: com.google.api.client.googleapis.json.GoogleJsonResponseException: 500 Internal Server Error
{
  "code" : 500,
  "errors" : [ {
    "domain" : "global",
    "message" : "Internal Error",
    "reason" : "internalError"
  } ],
  "message" : "Internal Error"
}
	at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:145)
	at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:113)
	at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:40)
	at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:321)
	at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1056)
	at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:419)
	at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352)
	at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:469)
	at com.tinylabproductions.google_play_uploader.actions.IAPs$$anonfun$doUpdates$1$1.apply(IAPs.scala:66)
	... 15 more

Process finished with exit code 1