Is $LD_LIBRARY_PATH set? The shared library loader is actually looking for libsmbclient.so.0, so you either don't have it, or the loader needs help finding it. For example, if libsmbclient.so.0 is in /usr/local/lib, try setting $LD_LIBRARY_PATH in your environment before running your script, e.g.:

   LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH
   export LD_LIBRARY_PATH
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