2015-06-25 08:32:33.194 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:33:33.261 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:34:33.338 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:35:33.406 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:36:33.434 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:37:33.509 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:38:33.578 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:39:33.628 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:40:33.690 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:41:33.718 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:42:13.549 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager._sync_power_states: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:42:33.758 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:43:33.843 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:44:33.909 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:45:33.959 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:46:33.990 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401) 2015-06-25 08:47:34.069 5431 ERROR nova.openstack.common.periodic_task [-] Error during ClusteredComputeManager.update_available_resource: The request you have made requires authentication. (HTTP 401)

how can fix this error?