Error processing block: Core.block.StartEnvironmentMinions

I am getting an error while creating a new environment initialization.I have created a new environment(like HabitatAUthoring) and in Postman, i use InitializeEnvironment call to initialize the environment.I get the following error.Any idea

System.Exception: Error processing block: Core.block.StartEnvironmentMinions —> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. —> System.ArgumentNullException: Value cannot be null.
Parameter name: type
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.Activator.CreateInstance(Type type)
at Sitecore.Commerce.Core.StartEnvironmentMinionsBlock.MinionStartup(MinionPolicy minionPolicy, CommerceEnvironment environment, CommercePipelineExecutionContext context)

I have tried solution at Can't bootstrap/initialize a new Sitecore Commerce 9 instance on Azure App Service but did not work.