Plesk supports various oerating systems and you missed to provide your current Plesk version ( incl. #MU ).
Pls. try to provide as much as possible informations, so that people willing to help you have a chance to help you with investigations and if you provide as well a step-by-step - guide, how we are able to reproduce your issue/error/problem, this could help to suggest work-arounds or/and resolutions for possible issues/errors/problems.
if you are able to reproduce your issue/error/problem and couldn't find any official KB - article for it, ro solve it, you might have found a new bug, which could be reported at: