What I did wrong here? I receive "Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client NodeJS", can somebody help me?

I am using:

Express mongoose (for MongoDB)

Controller

export const postResetPasswordEmail: Controller = async (req: Request, res: Response, next: NextFunction): Promise<void> => {
   const { email } = req.body
   try {
      const errors: IValidatorError = getValidationErrors(req)
      if (Object.keys(errors).length !== 0) {
         res.status(403).json({ errors })
         return
      }
      const user = await User.findOne({ email })
      if (!user) {
         res.status(404).json({ message: AuthenticationErrors.noEmailFound })
         return
      } else {
         if (!(user.passwordUpdatedAt === undefined || (new Date(user.passwordUpdatedAt) < new Date()))) {
            res.status(404).json({ message: AuthenticationErrors.error10MinutesPassword })
            return
         }
      }
      const token = generateJWT({ email }, JWTKEY, '10m')
      await sendResetPasswordMail(email, token, next)
      res.status(200)
         .json({ message: SuccessMessages.resetPassword })
   } catch (err: any) {
      catchError(err, next)
   }
}

sendResetPasswordMail

const sendResetPasswordMail: SendResetPasswordMail = async (userEmail: string, token: string, next: NextFunction): Promise<void> => {
   try {
      const transporter = nodemailer.createTransport({
         service: 'gmail',
         auth: {
            user: adminEmail.email,
            pass: adminEmail.pass
         }
      })
      const mailOptions = {
         from: adminEmail.email,
         to: userEmail,
         subject: 'Reset password',
         text: `Reset password: http://localhost:3000/resetPassword?token=${token}`
      }
      await transporter.sendMail(mailOptions)
   } catch (err: any) {
      catchError(err, next)
   }
}

generateJWT

const generateJWT: GenerateJWT = (userInfo: IUserInfo, JWTKEY: string, expireTime: string): string =>
   jwt.sign({ ...userInfo }, JWTKEY, { expiresIn: expireTime })