To elaborate slightly on
Podmaster's explanation: it wouldn't run without the "-w", because there was an extra character after "perl" -- a carriage return -- and the server does not have an executable file named "/usr/bin/perl\r" (or whatever path you're using.
Once you add the " -w" and upload again (using a method of file transfer that either adds or retains "\r" before every "\n"), "/usr/bin/perl" is now followed by a space, which is fine. (And once perl starts, it probably does the right thing with "-w\r".)
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