diff --git a/dashboard/src/services/api.ts b/dashboard/src/services/api.ts
index 80972ae..31ccfc5 100644
--- a/dashboard/src/services/api.ts
+++ b/dashboard/src/services/api.ts
@@ -10,7 +10,7 @@ const API_BASE_URL = '/api';
 export interface Session {
   id: string;
   name: string;
-  status: 'created' | 'idle' | 'initializing' | 'connecting' | 'qr_ready' | 'ready' | 'disconnected';
+  status: 'created' | 'idle' | 'initializing' | 'connecting' | 'qr_ready' | 'ready' | 'disconnected' | 'failed';
   phone?: string;
   pushName?: string;
   lastActive?: string;
diff --git a/src/modules/channel/channel.controller.ts b/src/modules/channel/channel.controller.ts
index c4c110d..053c98f 100644
--- a/src/modules/channel/channel.controller.ts
+++ b/src/modules/channel/channel.controller.ts
@@ -1,4 +1,4 @@
-import { Controller, Get, Post, Delete, Param, Body, Query } from '@nestjs/common';
+import { Controller, Get, Post, Delete, Param, Body, Query, BadRequestException, NotFoundException } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse, ApiParam, ApiBody, ApiQuery } from '@nestjs/swagger';
 import { SessionService } from '../session/session.service';
 
@@ -10,7 +10,7 @@ export class ChannelController {
   private getEngine(sessionId: string) {
     const engine = this.sessionService.getEngine(sessionId);
     if (!engine) {
-      throw new Error('Session is not started');
+      throw new BadRequestException('Session is not started');
     }
     return engine;
   }
@@ -41,7 +41,7 @@ export class ChannelController {
     const engine = this.getEngine(sessionId);
     const channel = await engine.getChannelById(channelId);
     if (!channel) {
-      throw new Error(`Channel ${channelId} not found`);
+      throw new NotFoundException(`Channel ${channelId} not found`);
     }
     return channel;
   }
diff --git a/src/modules/contact/contact.controller.ts b/src/modules/contact/contact.controller.ts
index 22310f2..72db80d 100644
--- a/src/modules/contact/contact.controller.ts
+++ b/src/modules/contact/contact.controller.ts
@@ -1,4 +1,4 @@
-import { Controller, Get, Post, Delete, Param, HttpCode, HttpStatus } from '@nestjs/common';
+import { Controller, Get, Post, Delete, Param, HttpCode, HttpStatus, BadRequestException, NotFoundException } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse, ApiParam } from '@nestjs/swagger';
 import { SessionService } from '../session/session.service';
 
@@ -19,7 +19,7 @@ export class ContactController {
   async findAll(@Param('sessionId') sessionId: string) {
     const engine = this.sessionService.getEngine(sessionId);
     if (!engine) {
-      throw new Error('Session is not started');
+      throw new BadRequestException('Session is not started');
     }
     return engine.getContacts();
   }
@@ -36,11 +36,11 @@ export class ContactController {
   async findOne(@Param('sessionId') sessionId: string, @Param('contactId') contactId: string) {
     const engine = this.sessionService.getEngine(sessionId);
     if (!engine) {
-      throw new Error('Session is not started');
+      throw new BadRequestException('Session is not started');
     }
     const contact = await engine.getContactById(contactId);
     if (!contact) {
-      throw new Error(`Contact ${contactId} not found`);
+      throw new NotFoundException(`Contact ${contactId} not found`);
     }
     return contact;
   }
@@ -56,7 +56,7 @@ export class ContactController {
   async checkNumber(@Param('sessionId') sessionId: string, @Param('number') number: string) {
     const engine = this.sessionService.getEngine(sessionId);
     if (!engine) {
-      throw new Error('Session is not started');
+      throw new BadRequestException('Session is not started');
     }
     const exists = await engine.checkNumberExists(number);
     return {
@@ -79,7 +79,7 @@ export class ContactController {
   async getProfilePicture(@Param('sessionId') sessionId: string, @Param('contactId') contactId: string) {
     const engine = this.sessionService.getEngine(sessionId);
     if (!engine) {
-      throw new Error('Session is not started');
+      throw new BadRequestException('Session is not started');
     }
     const url = await engine.getProfilePicture(contactId);
     return { url };
@@ -97,7 +97,7 @@ export class ContactController {
   async blockContact(@Param('sessionId') sessionId: string, @Param('contactId') contactId: string) {
     const engine = this.sessionService.getEngine(sessionId);
     if (!engine) {
-      throw new Error('Session is not started');
+      throw new BadRequestException('Session is not started');
     }
     await engine.blockContact(contactId);
     return { success: true, message: 'Contact blocked' };
@@ -114,7 +114,7 @@ export class ContactController {
   async unblockContact(@Param('sessionId') sessionId: string, @Param('contactId') contactId: string) {
     const engine = this.sessionService.getEngine(sessionId);
     if (!engine) {
-      throw new Error('Session is not started');
+      throw new BadRequestException('Session is not started');
     }
     await engine.unblockContact(contactId);
     return { success: true, message: 'Contact unblocked' };
diff --git a/src/modules/group/group.controller.ts b/src/modules/group/group.controller.ts
index 69a063d..65043de 100644
--- a/src/modules/group/group.controller.ts
+++ b/src/modules/group/group.controller.ts
@@ -1,4 +1,4 @@
-import { Controller, Get, Post, Put, Delete, Param, Body, HttpCode, HttpStatus } from '@nestjs/common';
+import { Controller, Get, Post, Put, Delete, Param, Body, HttpCode, HttpStatus, BadRequestException, NotFoundException } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse, ApiParam, ApiBody } from '@nestjs/swagger';
 import { SessionService } from '../session/session.service';
 
@@ -44,7 +44,7 @@ export class GroupController {
     const engine = this.getEngine(sessionId);
     const group = await engine.getGroupInfo(groupId);
     if (!group) {
-      throw new Error(`Group ${groupId} not found`);
+      throw new NotFoundException(`Group ${groupId} not found`);
     }
     return group;
   }
@@ -205,7 +205,7 @@ export class GroupController {
   private getEngine(sessionId: string) {
     const engine = this.sessionService.getEngine(sessionId);
     if (!engine) {
-      throw new Error('Session is not started');
+      throw new BadRequestException('Session is not started');
     }
     return engine;
   }
diff --git a/src/modules/label/label.controller.ts b/src/modules/label/label.controller.ts
index b6baead..d109dff 100644
--- a/src/modules/label/label.controller.ts
+++ b/src/modules/label/label.controller.ts
@@ -1,4 +1,4 @@
-import { Controller, Get, Post, Delete, Param, Body } from '@nestjs/common';
+import { Controller, Get, Post, Delete, Param, Body, BadRequestException, NotFoundException } from '@nestjs/common';
 import { ApiTags, ApiOperation, ApiResponse, ApiParam, ApiBody } from '@nestjs/swagger';
 import { SessionService } from '../session/session.service';
 
@@ -10,7 +10,7 @@ export class LabelController {
   private getEngine(sessionId: string) {
     const engine = this.sessionService.getEngine(sessionId);
     if (!engine) {
-      throw new Error('Session is not started');
+      throw new BadRequestException('Session is not started');
     }
     return engine;
   }
@@ -42,7 +42,7 @@ export class LabelController {
     const engine = this.getEngine(sessionId);
     const label = await engine.getLabelById(labelId);
     if (!label) {
-      throw new Error(`Label ${labelId} not found`);
+      throw new NotFoundException(`Label ${labelId} not found`);
     }
     return label;
   }