help please

[lsd4me2]

i downloaded  the  latest dev build, when I overwrite the primaries to SMPTE170m via filtering/misc i get this, 

Failed to evaluate the script:
Python exception: module 'vapoursynth' has no attribute 'PRIMARIES_ST170'
Traceback (most recent call last):
File "vapoursynth.pyx", line 3524, in vapoursynth._vpy_evaluate
File "vapoursynth.pyx", line 3525, in vapoursynth._vpy_evaluate
File "D:\TEMP\tempPreviewVapoursynthFile10_49_33_434.vpy", line 210, in
clip = core.std.SetFrameProps(clip=clip, _Primaries=vs.PRIMARIES_ST170)
^^^^^^^^^^^^^^^^^^
AttributeError: module 'vapoursynth' has no attribute 'PRIMARIES_ST170'. Did you mean: 'PRIMARIES_ST170_M'?