init motors errors

pfs@PFS-WS2:~$ oneCmd.py xcu_b1 motors init
2018-07-20T12:40:45.041 sent xcu_b1 motors init
2018-07-20T12:40:45.103 xcu_b1 f text="command failed: TypeError(\"%b requires a bytes-like object, or an object that implements __bytes__, not 'str'\",) at /software/mhs/products/Linux64/ics_xcuActor/1.7.5/python/xcuActor/Controllers/PCM.py:168"