System.MissingMethodException during ContainerCreating

[nickcalarco]

Running into a strange issue when deploying to our kubernetes cluster:

Unhandled exception. System.MissingMethodException: Method not found: 'System.Threading.Tasks.Task`1<System.Object> k8s.KubernetesExtensions.CreateNamespacedCustomObjectAsync(k8s.IKubernetes, System.Object, System.String, System.String, System.String, System.String, System.String, System.Threading.CancellationToken)'.
at Orleans.Clustering.Kubernetes.KubeMembershipTable.TryInitClusterVersion()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine)
at Orleans.Clustering.Kubernetes.KubeMembershipTable.TryInitClusterVersion()
at Orleans.Clustering.Kubernetes.KubeMembershipTable.InitializeMembershipTable(Boolean tryInitTableVersion)
at Orleans.Runtime.MembershipService.MembershipTableManager.Start()
at Orleans.Runtime.MembershipService.MembershipTableManager.<>c__DisplayClass54_0.<<Orleans-ILifecycleParticipant-Participate>g__OnRuntimeGrainServicesStart|0>d.MoveNext()
--- End of stack trace from previous location ---
at Orleans.Runtime.SiloLifecycleSubject.MonitoredObserver.OnStart(CancellationToken ct)
at Orleans.LifecycleSubject.OnStart(CancellationToken ct)
at Orleans.Runtime.Scheduler.AsyncClosureWorkItem.Execute()
at Orleans.Runtime.Silo.StartAsync(CancellationToken cancellationToken)
at Orleans.Hosting.SiloHost.StartAsync(CancellationToken cancellationToken)
at Orleans.Hosting.SiloHostedService.StartAsync(CancellationToken cancellationToken)
at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)
at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)
at POC.Silo.Program.Main(String[] args) in /home/vsts/work/1/s/POC.Silo/Program.cs:line 24
at POC.Silo.Program.

(String[] args)

Program.cs:line 24 represents the location where we're configuring our SiloHostBuilder:

...
siloBuilder
.ConfigureEndpoints(new Random(1).Next(10001, 10100), new Random(1).Next(20001, 20100))
.UseKubeMembership();
...

The recent change that I made was to upgrade the framework to net 5.0.

[nickcalarco]

I realize now that net core 3.1 is the prereq and I'm assuming this is my issue.