I have a problem with a component multisites.

The site was installed on the server "A " and everything worked without a problem.
I moved the site to better server "B" and the problem occurred.
When I select "Multi Sites / Templates / New" appeared the following error message:

"* JFolder:: folder: Path is not a folder
* JFolder:: files: Path is not a folder "

"Warning: Invalid argument Supplied for foreach () in / administrator / components / com_multisites / models / manage.php on line 1265

Warning: Invalid argument Supplied for foreach () in / administrator / components / com_multisites / models / manage.php on line 1296 "

Strange is it that when I log on to the admin panel without using the domain, everything works fine.

Please help. It is very important to me.

Thank you.

When you move an environment from one server to another one, you have to rebuild all the symbolic links and also update all the "deploy directory" path according to the new server location.

See the procedure that is described in the FAQ and that give you some guide lines on how to backup and restore an environment.
www.jms2win.com/en/faq/faq-joomla-multi-sites#cat-268

Here you clearly not have updated all the path and links of your server A to the new location of the server B.