fix error in role checking

src/api/users/roles.ts

@@ -3,12 +3,21 @@ import { changeUserRoles, getUserById } from "@/controller/UserController";
 
 export default async (req: Request, res: Response) => {
   try {
-    const user = await getUserById(req.userId);
-    if (user?.role !== "ADMIN" && user?.role !== "CREATOR") {
-      return res.status(403).send({ error: "Forbidden" });
-    }
-    const id = parseInt(req.params.id);
     const role = req.body.role;
+    
+    if (!role) {
+      return res.status(400).json({ error: "Role is required" });
+    }
+    const user = await getUserById(req.userId);
+    if (!user) {
+      return res.status(404).json({ error: "User not found" });
+    }
+    
+    if (user.role !== 'ADMIN' && user.role !== 'CREATOR') {
+      return res.status(403).json({ error: "You are not allowed to do this" });
+    }
+    
+    const id = parseInt(req.params.id);
     const changedUser = await changeUserRoles(id, role);
     if (changedUser instanceof Error) {
       return res.status(403).send(changedUser.message);