Hi this is the app developer over at Dell Sonicwall. Sorry for the bug. I have another release that will be going on this week to fix this bug. In the short term you can go to:
settings -> lookups -> lookup definitions -> app context = Dell Sonicwall Analytics -> sonicwall_os_guess -> disable
Or you can put a stub into the lookup file. The file is located $splunk_install/etc/apps/dsa/lookups/sonicwall_os_guess.csv
src_ip, start_time, os
1.1.1.1, "2014-01-01 01:01", windows
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