User:Resuna/The operation completed successfully
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The operation completed successfully
This is the equivalent on Windows of the traditional UNIX Not a typewriter or Error 0 messages, and is caused by having an application call the system "display an error message" API when no system-level message has yet occurred.
This typically happens when a routine returns failure because it failed to find a name (such as a user name) in an database or file (such as /etc/passwd), and the application assumes that the failure means an OS level failure occurred.