Cannot create a new domain on Plesk 12.0:
Error: vhostmng failed: The file exists. (Error code 80) at GetTempFileName in C:\Program Files (x86)\Parallels\Plesk\PrivateTemp
(Error code 1)
%plesk_dir%PrivateTemp folder is full: a new *.tmp file cannot be created due to insufficient file names. A filename is generated using four-symbol hexadecimal combination and all combinations are already used.
Remove old *.tmp files from the PrivateTemp folder.