I reinstalled libwbclient with following command according to this thread
yum reinstall libwbclient -y
enabled samba and now it works. But I’m still having unupdated kernel error:
You are running an unsupported kernel(4.10.6-1.el7.elrepo.x86_64). Some features may not work properly. Please reboot and the system will automatically boot using the supported kernel(4.12.4-1.el7.elrepo.x86_64)