diff --git a/src/packages/discovery/component/setting/setting.component.ts b/src/packages/discovery/component/setting/setting.component.ts
index 441c7f4..cefe0a0 100644
--- a/src/packages/discovery/component/setting/setting.component.ts
+++ b/src/packages/discovery/component/setting/setting.component.ts
@@ -159,6 +159,10 @@ export class SettingComponent implements OnInit, AfterContentInit {
 
   convertTreeView(zone: Zone) {
 
+    if (zone === undefined || zone === null) {
+      return;
+    }
+
     const treeNodes = this.convertViewHost(zone.hosts);
 
     console.log(treeNodes);
diff --git a/src/packages/discovery/store/discovery/discovery.action.ts b/src/packages/discovery/store/discovery/discovery.action.ts
new file mode 100644
index 0000000..52ac83c
--- /dev/null
+++ b/src/packages/discovery/store/discovery/discovery.action.ts
@@ -0,0 +1,84 @@
+// import { Action } from '@ngrx/store';
+
+// import { notificationActionEnum } from 'packages/core/rpc/store/notification';
+// import { RPCError } from 'packages/core/rpc/error';
+
+// import {
+//   Zone,
+//   Host,
+//   Port,
+//   Service,
+//   DiscoveryZone,
+//   DiscoveryHost,
+//   DiscoveryPort,
+//   DiscoveryService as MDiscoveryService,
+// } from '../../model';
+
+//  export enum ActionType {
+//   DiscoverZone = '[@@NOTIFICATION] DiscoveryService.discoverZone',
+//   DiscoverHost = '[@@NOTIFICATION] DiscoveryService.discoverHost',
+//   DiscoverPort = '[@@NOTIFICATION] DiscoveryService.discoverPort',
+//   DiscoverService = '[@@NOTIFICATION] DiscoveryService.discoverService',
+//   DiscoveredZone = '[@@NOTIFICATION] DiscoveryService.discoveredZone',
+//   DiscoveredHost = '[@@NOTIFICATION] DiscoveryService.discoveredHost',
+//   DiscoveredPort = '[@@NOTIFICATION] DiscoveryService.discoveredPort',
+//   DiscoveredService = '[@@NOTIFICATION] DiscoveryService.discoveredService',
+// }
+
+// export class DiscoverZone implements Action {
+//   readonly type = ActionType.DiscoverZone;
+
+//   constructor(public payload: {probeID: string, discoveryZone: DiscoveryZone}) {}
+// }
+
+// export class DiscoverHost implements Action {
+//   readonly type = ActionType.DiscoverHost;
+
+//   constructor(public payload: {probeID: string, zone: Zone, discoveryHost: DiscoveryHost}) {}
+// }
+
+// export class DiscoverPort implements Action {
+//   readonly type = ActionType.DiscoverPort;
+
+//   constructor(public payload: {probeID: string, host: Host, discoveryPort: DiscoveryPort}) {}
+// }
+
+// export class DiscoverService implements Action {
+//   readonly type = ActionType.DiscoverService;
+//   constructor(public payload: {probeID: string, port: Port, discoveryService: MDiscoveryService}) {}
+// }
+
+
+// export class DiscoveredZone implements Action {
+//   readonly type = ActionType.DiscoveredZone;
+
+//   constructor(public payload: Zone) {}
+// }
+
+// export class DiscoveredHost implements Action {
+//   readonly type = ActionType.DiscoveredHost;
+
+//   constructor(public payload: Host) {}
+// }
+
+// export class DiscoveredPort implements Action {
+//   readonly type = ActionType.DiscoveredPort;
+
+//   constructor(public payload: Port) {}
+// }
+
+// export class DiscoveredService implements Action {
+//   readonly type = ActionType.DiscoveredService;
+//   constructor(public payload: Service) {}
+// }
+
+// export type Actions =
+//   | DiscoverZone
+//   | DiscoverHost
+//   | DiscoverPort
+//   | DiscoverService
+//   | DiscoveredZone
+//   | DiscoveredHost
+//   | DiscoveredPort
+//   | DiscoveredService
+// ;
diff --git a/src/packages/discovery/store/discovery/discovery.effect.spec.ts b/src/packages/discovery/store/discovery/discovery.effect.spec.ts
new file mode 100644
index 0000000..e69de29
diff --git a/src/packages/discovery/store/discovery/discovery.effect.ts b/src/packages/discovery/store/discovery/discovery.effect.ts
new file mode 100644
index 0000000..e69de29
diff --git a/src/packages/discovery/store/discovery/discovery.reducer.ts b/src/packages/discovery/store/discovery/discovery.reducer.ts
new file mode 100644
index 0000000..e69de29
diff --git a/src/packages/discovery/store/discovery/discovery.state.ts b/src/packages/discovery/store/discovery/discovery.state.ts
new file mode 100644
index 0000000..e69de29
diff --git a/src/packages/discovery/store/discovery/index.ts b/src/packages/discovery/store/discovery/index.ts
new file mode 100644
index 0000000..e69de29