This was observed in the task log:
[2018/06/28 08:22:45.000] Running command 'shell.exec' in "call BF Suggestion service" (step 4 of 16) [2018/06/28 08:22:45.002] sh: 15: Syntax error: redirection unexpected [2018/06/28 08:22:45.002] Command failed: command [pid=12573] encountered problem: exit status 2