Cannot edit project in RVsitebuilder, "Upload Template" stuck or error "Project folder....is missing!"

Found problems:
1. Cannot edit project, it’s frozen at “Upload Template”
2. Cannot edit project, it puts an error:
>Project folder /var/cpanel/rvglobalsoft/rvsitebuilder/www/project/xxxxxxxxxxxxxxxxxxxxxxxxx is missing!<

Reasons:
1. RVsitebuilder is incompletely updated.
2. The project cannot create symlink.

Solutions:
1. Download RVsitebuilder installer again with force update version again.

cd /usr/local/cpanel/whostmgr/docroot/cgi/
rm -rf /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/
rm -f rvsitebuilderinstaller.tar
wget http://download.rvglobalsoft.com/rvsitebuilderinstaller.tar
tar -xvf rvsitebuilderinstaller.tar
rm -f rvsitebuilderinstaller.tar
chmod 755 /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/appconfig/registerapp
/usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/appconfig/registerapp
perl /usr/local/cpanel/whostmgr/docroot/cgi/rvsitebuilderinstaller/autoinstaller.cgi --force

After that, try to check edit project. If still doesn’t work, do the number 2 below.

2. Check if your server is running with selinux with the following command:

sestatus
SELinux status: enabled

If it's enabled, please set it to "Disable". And run clean folder with the following command:

find /var/cpanel/rvglobalsoft/rvsitebuilder/template -print0 |xargs -0 -n 1 setfattr -h -x security.selinux

find /var/cpanel/rvglobalsoft/rvsitebuilder/www -print0 |xargs -0 -n 1 setfattr -h -x security.selinux

Reference: How to disable SELinux
cPanel doesn't support selinux (Cancel URL: http://docs.cpanel.net/twiki/bin/view/AllDocumentation/InstallationGuide/ConfiguringOs#Disable)

Important: For cPanel & WHM to run on your server, SELinux must remain disabled. You should make sure that the pound sign (#) does notprecede SELINUX=disabled. If # precedes this configuration option, the line will be ignored.