Startup of MSSQLServer fails with this listed in Event Viewer and no real additional information. I found that a second startup parameter for the master_log_path was added pointing to an invalid file, conflicting with the default (mastlog.ldf). The only resolution was via Regedit -> HKLM\Software\Microsoft\MSSQLServer\Parameters\SQLArg#.
Look for a duplicate -l pointing to anything but the mastlog.ldf and remove it. This may cause some errors on the master_file_path and error_log_path; situation that I have not tested.
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