AttributeError from mode_USAXS()

[prjemian]

while testing mode_USAXS(), received this exception trace:

In [35]: summarize_plan(mode_USAXS())
user_data_state -> Moving USAXS to USAXS mode
ccd_shutter -> close
usaxs_shutter -> close
monochromator_feedback_on -> 1
Found UsaxsSaxsMode = out of beam
Moving to proper USAXS mode
ccd_shutter -> close
usaxs_shutter -> close
Moving WAXS out of beam
terms_SAXS_UsaxsSaxsMode -> -1
waxsx -> 0.0
waxsx_soft_limit_lo -> 5.0
waxsx_soft_limit_hi -> 5.0
Removed WAXS from beam position
terms_SAXS_UsaxsSaxsMode -> 1
ccd_shutter -> close
usaxs_shutter -> close
Moving SAXS out of beam
terms_SAXS_UsaxsSaxsMode -> -1
saxs_stage_z -> 50.0
saxs_stage_z_soft_limit_lo -> 48.0
saxs_stage_z_soft_limit_hi -> 147.999954
saxs_stage_y -> 260.0
saxs_stage_y_soft_limit_lo -> 257.0
saxs_stage_y_soft_limit_hi -> 257.0
Removed SAXS from beam position
terms_SAXS_UsaxsSaxsMode -> 1
ccd_shutter -> close
usaxs_shutter -> close
Moving to USAXS mode
terms_SAXS_UsaxsSaxsMode -> -1
a_stage_x_soft_limit_lo -> -50.0
a_stage_x_soft_limit_hi -> 168.52500000000003
d_stage_x_soft_limit_lo -> 79.67625
d_stage_x_soft_limit_hi -> 79.67999999999995
---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
/APSshare/anaconda3/BlueSky/lib/python3.6/site-packages/ophyd/device.py in __getattr__(self, name)
    983                 # Initial access of signal
--> 984                 cpt = self._sig_attrs[name]
    985                 return cpt.__get__(self, None)

KeyError: 'vap'

During handling of the above exception, another exception occurred:

AttributeError                            Traceback (most recent call last)
<ipython-input-35-1de9224e6c94> in <module>()
----> 1 summarize_plan(mode_USAXS())

/APSshare/anaconda3/BlueSky/lib/python3.6/site-packages/bluesky/simulators.py in summarize_plan(plan)
     70         Must yield `Msg` objects
     71     """
---> 72     for msg in print_summary_wrapper(plan):
     73         ...
     74 

/APSshare/anaconda3/BlueSky/lib/python3.6/site-packages/bluesky/preprocessors.py in print_summary_wrapper(plan)
    286 
    287     read_cache = []
--> 288     for msg in plan:
    289         cmd = msg.command
    290         if cmd == 'open_run':

<ipython-input-31-86a659f8e6b7> in mode_USAXS()
     17         yield from move_WAXSOut()
     18         yield from move_SAXSOut()
---> 19         yield from move_USAXSIn()
     20         retune_needed = True
     21 

/home/beams11/USAXS/.ipython/profile_bluesky/startup/41-commands.py in move_USAXSIn()
    246         guard_slit.h_size,  terms.SAXS.usaxs_guard_h_size.value,
    247         guard_slit.v_size,  terms.SAXS.usaxs_guard_v_size.value,
--> 248         usaxs_slit.vap,     terms.SAXS.usaxs_v_size.value,
    249         usaxs_slit.hap,     terms.SAXS.usaxs_h_size.value,
    250         a_stage.y,          terms.USAXS.AY0.value,

/APSshare/anaconda3/BlueSky/lib/python3.6/site-packages/ophyd/device.py in __getattr__(self, name)
    985                 return cpt.__get__(self, None)
    986             except KeyError:
--> 987                 raise AttributeError(name)
    988 
    989         attr_names = name.split('.')

AttributeError: vap