validation error is giving internal error instead about service HOT 2 CLOSED

switch {
    case response.IsError(err):
    reqErr := response.GetError(err)

    if validate.IsFieldErrors(reqErr.Err) {
        fieldErrors := validate.GetFieldErrors(reqErr.Err)
        er = response.ErrorDocument{
            Error:  "data validation error",
            Fields: fieldErrors.Fields(),
        }
        status = reqErr.Status
        break
    }

    var app AppNewProduct
    if err := web.Decode(r, &app); err != nil {
        return response.NewError(err, http.StatusBadRequest)
    }

    if v, ok := val.(validator); ok {
        if err := v.Validate(); err != nil {
            return fmt.Errorf("unable to validate payload: %w", err)
        }
    }

    func (app AppNewProduct) Validate() error {
        if err := validate.Check(app); err != nil {
             return err
        }

        return nil
    }

    func Check(val any) error {
	if err := validate.Struct(val); err != nil {

		// Use a type assertion to get the real error value.
		verrors, ok := err.(validator.ValidationErrors)
		if !ok {
			return err
		}

		var fields FieldErrors
		for _, verror := range verrors {
			field := FieldError{
				Field: verror.Field(),
				Err:   verror.Translate(translator),
			}
			fields = append(fields, field)
		}

		return fields
	}

	return nil
}

    return response.NewError(err, http.StatusBadRequest)