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-s is kind of holy, so it’s surprising to see it is giving you an error.
I have a sneaking suspicion that it is some sort of character formatting error – like the CR/LF issue that often plagues raw text files moved from *nix systems to windows.
The first thing I would try is re-ordering the flags in your file; it may be that something is broken somewhere such that no flags are read in properly.
The next thing I would try is running with no other flags but -help; check that -s does appear in that (very long) list as it should.
Also try -in:file:s instead (that is its full name).