An invocation is copy of a command sent to a specific instance. A command can apply to one or more instances. A command invocation applies to one instance. For example, if a user executes SendCommand against three instances, then a command invocation is created for each requested instance ID. ListCommandInvocations provide status about command execution.
/// An error occurred on the server side.
///
///
///
/// The specified key is not valid.
///
/// The following problems can cause this exception:
///
///
///
/// You do not have permission to access the instance.
///
///
///
/// The SSM agent is not running. On managed instances and Linux instances, verify that
/// the SSM agent is running. On EC2 Windows instances, verify that the EC2Config service
/// is running.
///
///
///
/// The SSM agent or EC2Config service is not registered to the SSM endpoint. Try reinstalling
/// the SSM agent or EC2Config service.
///
///
///
/// The instance is not in valid state. Valid states are: Running, Pending, Stopped, Stopping.
/// Invalid states are: Shutting-down and Terminated.
///
///
/// The specified token is not valid.
///
