When trying to manage the accounts from plesk panel 12.0, you get an error as below.
QuoteError: The system cannot find the file specified.
It is because the the update within plesk that needs to be re installed. Simply, login your windows server via RDP and access command prompt. Execute the command below which will perform the updates.
Quote"%plesk_bin%\ai.exe" --select-release-current --upgrade-installed-components
This error also occurs when you try to add a MSSQL database, create FTP accounts OR when trying to set subscription.