diff --git a/backend/src/libs/socket.ts b/backend/src/libs/socket.ts
index ec82552..cf5bcbf 100644
--- a/backend/src/libs/socket.ts
+++ b/backend/src/libs/socket.ts
@@ -1,5 +1,6 @@
 import socketIo, { Server as SocketIO } from "socket.io";
 import { Server } from "http";
+import AppError from "../errors/AppError";
 
 let io: SocketIO;
 
@@ -9,7 +10,7 @@ export const initIO = (httpServer: Server): SocketIO => {
 };
 export const getIO = (): SocketIO => {
   if (!io) {
-    throw new Error("Socket IO not initialized");
+    throw new AppError("Socket IO not initialized");
   }
   return io;
 };
diff --git a/backend/src/libs/wbot.js b/backend/src/libs/wbot.js
index 86ee3a0..6ba443d 100644
--- a/backend/src/libs/wbot.js
+++ b/backend/src/libs/wbot.js
@@ -1,110 +1,110 @@
-const qrCode = require("qrcode-terminal");
-const { Client } = require("whatsapp-web.js");
-const Whatsapp = require("../models/Whatsapp");
-const { getIO } = require("../libs/socket");
-
-let sessions = [];
-
-module.exports = {
-	initWbot: async whatsapp => {
-		try {
-			const io = getIO();
-			const sessionName = whatsapp.name;
-			let sessionCfg;
-
-			if (whatsapp && whatsapp.session) {
-				sessionCfg = JSON.parse(whatsapp.session);
-			}
-
-			const sessionIndex = sessions.findIndex(s => s.id === whatsapp.id);
-			if (sessionIndex !== -1) {
-				sessions[sessionIndex].destroy();
-				sessions.splice(sessionIndex, 1);
-			}
-
-			const wbot = new Client({
-				session: sessionCfg,
-				restartOnAuthFail: true,
-			});
-			wbot.initialize();
-
-			wbot.on("qr", async qr => {
-				console.log("Session:", sessionName);
-
-				qrCode.generate(qr, { small: true });
-
-				await whatsapp.update({ qrcode: qr, status: "qrcode" });
-
-				io.emit("whatsappSession", {
-					action: "update",
-					session: whatsapp,
-				});
-			});
-
-			wbot.on("authenticated", async session => {
-				console.log("Session:", sessionName, "AUTHENTICATED");
-
-				await whatsapp.update({
-					session: JSON.stringify(session),
-					status: "authenticated",
-				});
-
-				io.emit("whatsappSession", {
-					action: "update",
-					session: whatsapp,
-				});
-			});
-
-			wbot.on("auth_failure", async msg => {
-				console.error("Session:", sessionName, "AUTHENTICATION FAILURE", msg);
-
-				await whatsapp.update({ session: "" });
-			});
-
-			wbot.on("ready", async () => {
-				console.log("Session:", sessionName, "READY");
-
-				await whatsapp.update({
-					status: "CONNECTED",
-					qrcode: "",
-				});
-
-				io.emit("whatsappSession", {
-					action: "update",
-					session: whatsapp,
-				});
-
-				wbot.sendPresenceAvailable();
-			});
-
-			wbot.id = whatsapp.id;
-			sessions.push(wbot);
-		} catch (err) {
-			console.log(err);
-		}
-
-		return null;
-	},
-
-	getWbot: whatsappId => {
-		const sessionIndex = sessions.findIndex(s => s.id === whatsappId);
-
-		if (sessionIndex === -1) {
-			console.log("This Wbot session is not initialized");
-			return null;
-		}
-		return sessions[sessionIndex];
-	},
-
-	removeWbot: whatsappId => {
-		try {
-			const sessionIndex = sessions.findIndex(s => s.id === whatsappId);
-			if (sessionIndex !== -1) {
-				sessions[sessionIndex].destroy();
-				sessions.splice(sessionIndex, 1);
-			}
-		} catch (err) {
-			console.log(err);
-		}
-	},
-};
+const qrCode = require("qrcode-terminal");
+const { Client } = require("whatsapp-web.js");
+const Whatsapp = require("../models/Whatsapp");
+const { getIO } = require("../libs/socket");
+
+let sessions = [];
+
+module.exports = {
+  initWbot: async whatsapp => {
+    try {
+      const io = getIO();
+      const sessionName = whatsapp.name;
+      let sessionCfg;
+
+      if (whatsapp && whatsapp.session) {
+        sessionCfg = JSON.parse(whatsapp.session);
+      }
+
+      const sessionIndex = sessions.findIndex(s => s.id === whatsapp.id);
+      if (sessionIndex !== -1) {
+        sessions[sessionIndex].destroy();
+        sessions.splice(sessionIndex, 1);
+      }
+
+      const wbot = new Client({
+        session: sessionCfg,
+        restartOnAuthFail: true
+      });
+      wbot.initialize();
+
+      wbot.on("qr", async qr => {
+        console.log("Session:", sessionName);
+
+        qrCode.generate(qr, { small: true });
+
+        await whatsapp.update({ qrcode: qr, status: "qrcode" });
+
+        io.emit("whatsappSession", {
+          action: "update",
+          session: whatsapp
+        });
+      });
+
+      wbot.on("authenticated", async session => {
+        console.log("Session:", sessionName, "AUTHENTICATED");
+
+        await whatsapp.update({
+          session: JSON.stringify(session),
+          status: "authenticated"
+        });
+
+        io.emit("whatsappSession", {
+          action: "update",
+          session: whatsapp
+        });
+      });
+
+      wbot.on("auth_failure", async msg => {
+        console.error("Session:", sessionName, "AUTHENTICATION FAILURE", msg);
+
+        await whatsapp.update({ session: "" });
+      });
+
+      wbot.on("ready", async () => {
+        console.log("Session:", sessionName, "READY");
+
+        await whatsapp.update({
+          status: "CONNECTED",
+          qrcode: ""
+        });
+
+        io.emit("whatsappSession", {
+          action: "update",
+          session: whatsapp
+        });
+
+        wbot.sendPresenceAvailable();
+      });
+
+      wbot.id = whatsapp.id;
+      sessions.push(wbot);
+    } catch (err) {
+      console.log(err);
+    }
+
+    return null;
+  },
+
+  getWbot: whatsappId => {
+    const sessionIndex = sessions.findIndex(s => s.id === whatsappId);
+
+    if (sessionIndex === -1) {
+      console.log("This Wbot session is not initialized");
+      return null;
+    }
+    return sessions[sessionIndex];
+  },
+
+  removeWbot: whatsappId => {
+    try {
+      const sessionIndex = sessions.findIndex(s => s.id === whatsappId);
+      if (sessionIndex !== -1) {
+        sessions[sessionIndex].destroy();
+        sessions.splice(sessionIndex, 1);
+      }
+    } catch (err) {
+      console.log(err);
+    }
+  }
+};