Sometimes it is not possible to access Parallels Plesk Panel. Browser displays following error:
[box style=’error’]ERROR: SWKeyExFatalError
xmlrpc error: Expected <param> to have 1 children, found 0
The above error seems that registry.xml file may have gone corrupted.
Resolution of above error is very simple:
Check the size of the file %plesk_dir%\admin\repository\registry.xml. If the file is empty and its size equals to 0KB, delete this file.
Once it is deleted, try to access Parallels Plesk Panel again. A new file should be generated automatically.