Unable to run locally

Unable to run AudioVideoPlaybackBot locally because the cert has problem:

Sample.AudioVideoPlaybackBot.WorkerRole.ConfigurationException: 'Parameter name: DefaultCertificate
No certificate with thumbprint ABC0000000000000000000000000000000000CBA was found in the machine store.'

This exception was originally thrown at this call stack:
Sample.AudioVideoPlaybackBot.WorkerRole.AzureConfiguration.GetCertificateFromStore(string) in AzureConfiguration.cs
Sample.AudioVideoPlaybackBot.WorkerRole.AzureConfiguration.Initialize() in AzureConfiguration.cs
Sample.AudioVideoPlaybackBot.WorkerRole.AzureConfiguration.AzureConfiguration(Microsoft.Graph.Communications.Common.Telemetry.IGraphLogger) in AzureConfiguration.cs
Sample.AudioVideoPlaybackBot.WorkerRole.WorkerRole.OnStart() in WorkerRole.cs
Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.InitializeRoleInternal(Microsoft.WindowsAzure.ServiceRuntime.Implementation.Loader.RoleType)
Microsoft.WindowsAzure.ServiceRuntime.Implementation.Loader.RoleRuntimeBridge.InitializeRole.AnonymousMethod__0()

Please help
Thanks

Start with AzureConfiguration.cs, especially GetCertificateFromStore(string) and Initialize(), then trace how WorkerRole.cs calls AzureConfiguration during OnStart(). Determine why the local machine store lacks the configured DefaultCertificate and verify that the AudioVideoPlaybackBot starts locally without the reported ConfigurationException.