SYMPTOMS
When tried to remove the domain from Plesk Control Panel, the following error message is occurred:
Error: Unable to remove domains: Problems occured while removing
domains: Unable to remove hosting: Unable to delete system user:
SysUser->systemRemove() failed: usermng failed: Empty input path: (87)
The parameter is incorrect.
CAUSE
'Local path' parameter for FTP user of this domain is missed.
RESOLUTION
Please, go to Computer Management, Local Users and Groups, Users, select FTP user for this domain, go to Properties, Profile and check if 'Local path' parameter is specified there.
If not, please, specify proper path to this domain directory %plesk_vhosts%\domain.tld.