java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: Unable to create call adapter for java.util.concurrent.CompletableFuture<retrofit2.Response<okhttp3.ResponseBody>>

[Jsunny271]

Facing this issue since days please help.

ERROR c.m.b.i.AdapterWithErrorHandler - NO_USER onTurnError
java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: Unable to create call adapter for java.util.concurrent.CompletableFuture<retrofit2.Response<okhttp3.ResponseBody>>
for method ConversationsService.replyToActivity
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273)
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280)
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1606)
at java.util.concurrent.CompletableFuture$AsyncSupply.exec(CompletableFuture.java:1596)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:175)
Caused by: java.lang.IllegalArgumentException: Unable to create call adapter for java.util.concurrent.CompletableFuture<retrofit2.Response<okhttp3.ResponseBody>>
for method ConversationsService.replyToActivity
at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:720)
at retrofit2.ServiceMethod$Builder.createCallAdapter(ServiceMethod.java:234)
at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:160)
at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:166)
at retrofit2.Retrofit$1.invoke(Retrofit.java:145)
at com.microsoft.bot.connector.rest.$Proxy516.replyToActivity(Unknown Source)
at com.microsoft.bot.connector.rest.RestConversations.replyToActivity(RestConversations.java:460)
at com.microsoft.bot.connector.Conversations.replyToActivity(Conversations.java:202)
at com.microsoft.bot.builder.BotFrameworkAdapter.lambda$sendActivities$5(BotFrameworkAdapter.java:618)
at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1604)
... 5 common frames omitted
Caused by: java.lang.IllegalArgumentException: Could not locate call adapter for java.util.concurrent.CompletableFuture<retrofit2.Response<okhttp3.ResponseBody>>.
Tried:

• retrofit2.DefaultCallAdapterFactory
  at retrofit2.Retrofit.nextCallAdapter(Retrofit.java:237)
  at retrofit2.Retrofit.callAdapter(Retrofit.java:201)
  at retrofit2.ServiceMethod$Builder.createCallAdapter(ServiceMethod.java:232)
  ... 13 common frames omitted
  Expand (31 lines)

[tracyboehrer]

The Java SDK and samples reached end of life November 2023 and are no longer support. The samples are retrained as a convenience to existing customer for a period.