Explanation: (Note: This is different from the more common message "dbspawn/dbsrv17 set ERRORLEVEL = 1".)

If the "dbspawn/dbsrv17 set ERRORLEVEL = 0" message appears by itself, without any other error messages, it is probably safe to ignore; it is probably a false error which is sometimes displayed by the "debug" scripts used to start the Foxhound engine:

Help - Introduction - Starting Foxhound - Method 2: Debug Startup

See also...
dbspawn/dbsrv17 set ERRORLEVEL = 1