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It happened to me twice but could not reproduce it reliably.
__DistroRid: osx-arm64
Determining projects to restore...
Unhandled exception: System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
---> System.NullReferenceException: Object reference not set to an instance of an object.
at System.RuntimeType.get_IsGenericTypeDefinition()
at System.RuntimeType.MakeGenericType(Type[] instantiation)
at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.PopulateInterfaces(Filter filter)
at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.GetListByName(Char* pName, Int32 cNameLen, Byte* pUtf8Name, Int32 cUtf8Name, MemberListType listType, CacheType cacheType)
at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.Populate(String name, MemberListType listType, CacheType cacheType)
at System.RuntimeType.GetInterfaces()
at System.Text.Json.Reflection.ReflectionExtensions.GetCompatibleGenericInterface(Type type, Type interfaceType)
at System.Text.Json.Serialization.IAsyncEnumerableConverterFactory.CanConvert(Type typeToConvert)
at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetBuiltInConverter(Type typeToConvert)
at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetConverterForType(Type typeToConvert, JsonSerializerOptions options, Boolean resolveJsonConverterAttribute)
at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.CreateJsonTypeInfo(Type type, JsonSerializerOptions options)
at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetTypeInfo(Type type, JsonSerializerOptions options)
at System.Text.Json.JsonSerializerOptions.GetTypeInfoNoCaching(Type type)
at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
at System.Text.Json.JsonSerializerOptions.GetTypeInfoInternal(Type type, Boolean ensureConfigured, Boolean resolveIfMutable)
at System.Text.Json.JsonSerializer.GetTypeInfo(JsonSerializerOptions options, Type inputType)
at System.Text.Json.JsonSerializer.GetTypeInfo[T](JsonSerializerOptions options)
at System.Text.Json.JsonSerializer.Deserialize[TValue](String json, JsonSerializerOptions options)
at Microsoft.DotNet.ToolPackage.LocalToolsResolverCache.GetCacheTable(String packageCacheFile)
at Microsoft.DotNet.ToolPackage.LocalToolsResolverCache.TryLoad(RestoredCommandIdentifier restoredCommandIdentifier, RestoredCommand& restoredCommand)
at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.PackageHasBeenRestored(ToolManifestPackage package, String targetFramework)
at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.InstallPackages(ToolManifestPackage package, Nullable`1 configFile)
at System.Linq.Parallel.SelectQueryOperator`2.SelectQueryOperatorResults.GetElement(Int32 index)
at System.Linq.Parallel.QueryResults`1.get_Item(Int32 index)
at System.Linq.Parallel.PartitionedDataSource`1.ListContiguousIndexRangeEnumerator.MoveNext(T& currentElement, Int32& currentKey)
at System.Linq.Parallel.StopAndGoSpoolingTask`2.SpoolingWork()
at System.Linq.Parallel.SpoolingTaskBase.Work()
at System.Linq.Parallel.QueryTask.BaseWork(Object unused)
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
--- End of inner exception stack trace ---
at System.Linq.Parallel.QueryTaskGroupState.QueryEnd(Boolean userInitiatedDispose)
at System.Linq.Parallel.SpoolingTask.SpoolStopAndGo[TInputOutput,TIgnoreKey](QueryTaskGroupState groupState, PartitionedStream`2 partitions, SynchronousChannel`1[] channels, TaskScheduler taskScheduler)
at System.Linq.Parallel.DefaultMergeHelper`2.System.Linq.Parallel.IMergeHelper<TInputOutput>.Execute()
at System.Linq.Parallel.MergeExecutor`1.Execute()
at System.Linq.Parallel.MergeExecutor`1.Execute[TKey](PartitionedStream`2 partitions, Boolean ignoreOutput, ParallelMergeOptions options, TaskScheduler taskScheduler, Boolean isOrdered, CancellationState cancellationState, Int32 queryId)
at System.Linq.Parallel.PartitionedStreamMerger`1.Receive[TKey](PartitionedStream`2 partitionedStream)
at System.Linq.Parallel.UnaryQueryOperator`2.UnaryQueryOperatorResults.GivePartitionedStream(IPartitionedStreamRecipient`1 recipient)
at System.Linq.Parallel.QueryOperator`1.ExecuteAndGetResultsAsArray()
at System.Linq.ParallelEnumerable.ToArray[TSource](ParallelQuery`1 source)
at Microsoft.DotNet.Tools.Tool.Restore.ToolRestoreCommand.Execute()
at System.CommandLine.Invocation.InvocationPipeline.<>c__DisplayClass4_0.<<BuildInvocationChain>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.DotNet.Cli.Parser.<>c__DisplayClass17_0.<<UseParseErrorReporting>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass11_0.<<UseHelp>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at System.CommandLine.CommandLineBuilderExtensions.<>c.<<UseSuggestDirective>b__17_0>d.MoveNext()
--- End of stack trace from previous location ---
at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass15_0.<<UseParseDirective>b__0>d.MoveNext()
--- End of stack trace from previous location ---
at System.CommandLine.CommandLineBuilderExtensions.<>c__DisplayClass7_0.<<UseExceptionHandler>b__0>d.MoveNext()
Version: 8.0.100-alpha.1.23068.1
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