[CentOS] You have not permission to view content of this location

OS: CentosOS 7

I have installed samba + openldap + smbldap-tools + pam by:

    yum --enablerepo=extras install -y epel-release
    yum install -y smbldap-tools
    yum install -y samba openldap openldap-clients openldap-servers migrationtools
    yum install -y nss-pam*

I know that smbldap-tools is a dead project, but I'm interested in it and would like research on it.

I create users and groups by:

sudo smbldap-groupadd -a g1
sudo smbldap-groupadd -a g2
sudo smbldap-useradd -a -P -g 1001 u1
sudo smbldap-useradd -a -P -g 1002 u1

groups u1
u1 : g1

groups u2
u2 : g2

I create shared folder:

cd /
sudo mkdir data

sudo chown u1 /data
sudo chgrp g1 /data

sudo chmod ugo+rwx /data

I edit /etc/samba/smb.conf:

[data]
    comment = data
    path = /data
    valid users = u1,u2
    write list = u1,u2
    create mask = 0777
    sync always = Yes
;    hide dot files = yes
;    writeable = no

And then:

sudo service smb restart

When I open file manager and input following in location box:

smb://127.0.0.1

The shared folder data is shown, I click the shared folder and input username u1 and password, I get error message: You have not permission to view content of this location

The error message is Chinese in my system, I translate it into English.

Thanks