Anthropic Fable 5 error after plan mode

2026-06-10 21:27:34.055 [DefaultDispatcher-worker-5] INFO c.i.m.l.m.ArtifactRequestExecutorService - Resolved agent for requester issue.md///issue///step_01.junie_standalone_single_step event LlmRequestFailed(id=14091118-f02e-4e01-9026-b3b43d7b3307): MainAgent(id=main, name=main)
2026-06-10 21:27:34.055 [DefaultDispatcher-worker-5] WARN c.i.m.l.m.ArtifactRequestExecutorService - Failed to create artifact: step_01.junie_standalone_single_step
kotlinx.serialization.SerializationException: com.intellij.ml.llm.matterhorn.core.llm.anthropic.AnthropicStopReason does not contain element with name 'refusal' at path $.stop_reason
at kotlinx.serialization.json.internal.JsonNamesMapKt.getJsonNameIndexOrThrow(JsonNamesMap.kt:107)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeEnum(StreamingJsonDecoder.kt:353)
at kotlinx.serialization.internal.EnumSerializer.deserialize(Enums.kt:136)
at kotlinx.serialization.internal.EnumSerializer.deserialize(Enums.kt:102)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:69)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableValue(AbstractDecoder.kt:43)
at kotlinx.serialization.encoding.AbstractDecoder.decodeSerializableElement(AbstractDecoder.kt:70)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableElement(StreamingJsonDecoder.kt:168)
at com.intellij.ml.llm.matterhorn.core.llm.anthropic.AnthropicResponse$$serializer.deserialize(AnthropicResponse.kt:6)
at com.intellij.ml.llm.matterhorn.core.llm.anthropic.AnthropicResponse$$serializer.deserialize(AnthropicResponse.kt:6)
at kotlinx.serialization.json.internal.StreamingJsonDecoder.decodeSerializableValue(StreamingJsonDecoder.kt:69)
at kotlinx.serialization.json.internal.JsonStreamsKt.decodeByReader(JsonStreams.kt:111)
at kotlinx.serialization.json.JvmStreamsKt.decodeFromStream(JvmStreams.kt:61)
at com.intellij.ml.llm.matterhorn.core.llm.anthropic.AnthropicChatRequest$executeWithoutSteaming$2.invokeSuspend(AnthropicChatRequest.kt:335)
at com.intellij.ml.llm.matterhorn.core.llm.anthropic.AnthropicChatRequest$executeWithoutSteaming$2.invoke(AnthropicChatRequest.kt)
at com.intellij.ml.llm.matterhorn.core.llm.anthropic.AnthropicChatRequest$executeWithoutSteaming$2.invoke(AnthropicChatRequest.kt)
at io.ktor.client.statement.HttpStatement.execute(HttpStatement.kt:57)
at io.ktor.client.statement.HttpStatement$execute$1.invokeSuspend(HttpStatement.kt)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:124)
at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:586)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:820)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:717)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)
2026-06-10 21:27:34.058 [DefaultDispatcher-worker-5] INFO c.i.m.l.m.c.a.i.AnalyticsClientImpl - [FUS:EVENT] type=agent_step_finished properties=step_type=null, model=claude-fable-5, duration_ms=null, model_stats_cost=null, step_result=EXIT_UNEXPECTED_EXCEPTION
2026-06-10 21:27:34.059 [DefaultDispatcher-worker-5] INFO c.i.m.l.m.a.AbstractIssueAgentWorker - [Memory] Task finished, MemoryManager continues running in background
2026-06-10 21:27:34.059 [DefaultDispatcher-worker-5] WARN c.i.m.l.m.ArtifactRequestExecutorService - Failed to create artifact: issue.issue
com.intellij.ml.llm.matterhorn.FailedDependencyException: Failed to build 'step_01.junie_standalone_single_step'
at com.intellij.ml.llm.matterhorn.ExecutionContext.getOrCreateArtifact(ExecutionContext.kt:148)
at com.intellij.ml.llm.matterhorn.ExecutionContext$getOrCreateArtifact$2.invokeSuspend(ExecutionContext.kt)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
at kotlinx.coroutines.internal.ScopeCoroutine.afterResume(Scopes.kt:35)
at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:101)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:47)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:98)
at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:124)
at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:586)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:820)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:717)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)
2026-06-10 21:27:34.059 [DefaultDispatcher-worker-5] INFO c.i.m.l.m.c.a.i.AnalyticsClientImpl - [FUS:EVENT] type=task_request_finished properties=status=Failed, duration_ms=null, viewed_files=/home/user/IdeaProjects/legally-questionable.cubegame/src/main/kotlin/tech/lenooby09/legally_questionable/cubegame/entity/damage/DamageSource.kt,/home/user/IdeaProjects/legally-questionable.cubegame/src/main/kotlin/tech/lenooby09/legally_questionable/cubegame/entity/damage/EntityDamageSource.kt, changed_files=null, traceback=com.intellij.ml.llm.matterhorn.FailedDependencyException: Failed to build 'issue.issue'
at com.intellij.ml.llm.matterhorn.ExecutionContext.getOrCreateArtifact(ExecutionContext.kt:148)
at com.intellij.ml.llm.matterhorn.ExecutionContext$getOrCreateArtifact$2.invokeSuspend(ExecutionContext.kt)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
at kotlinx.coroutines.internal.ScopeCoroutine.afterResume(Scopes.kt:35)
at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:101)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:47)
at kotlinx.coroutines.internal.ScopeCoroutine.afterResume(Scopes.kt:35)
at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:101)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:47)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:98)
at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:124)
at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:586)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:820)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:717)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)
, lines_added=0, lines_removed=0, tool_calls=0
2026-06-10 21:27:34.060 [DefaultDispatcher-worker-5] WARN c.i.m.l.m.ArtifactRequestExecutorService - Failed to create artifact: issue.md.junie_standalone
com.intellij.ml.llm.matterhorn.FailedDependencyException: Failed to build 'issue.issue'
at com.intellij.ml.llm.matterhorn.ExecutionContext.getOrCreateArtifact(ExecutionContext.kt:148)
at com.intellij.ml.llm.matterhorn.ExecutionContext$getOrCreateArtifact$2.invokeSuspend(ExecutionContext.kt)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
at kotlinx.coroutines.internal.ScopeCoroutine.afterResume(Scopes.kt:35)
at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:101)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:47)
at kotlinx.coroutines.internal.ScopeCoroutine.afterResume(Scopes.kt:35)
at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:101)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:47)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:98)
at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:124)
at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:89)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:586)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:820)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:717)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)