[cctbxbb] flex.histogram giving ArgumentError when arguments correct

[Winter, Graeme (DLSLtd,RAL,LSCI)]

H = flex.histogram(coords, data_min=0.0, data_max=dim, n_slots=dim)

Gives

Boost.Python.ArgumentError: Please report this error to dials-support at lists.sourceforge.net: Python argument types in
    histogram.__init__(histogram)
did not match C++ signature:
    __init__(_object*, double, double, double, scitbx::af::shared<long>, unsigned long)
    __init__(_object*, scitbx::histogram<double, long> other, scitbx::af::const_ref<double, scitbx::af::trivial_accessor> data, double relative_tolerance=0.0001)
    __init__(_object*, scitbx::af::const_ref<double, scitbx::af::trivial_accessor> data, double data_min, double data_max, unsigned long n_slots=1000, double relative_tolerance=0.0001)
    __init__(_object*, scitbx::af::const_ref<double, scitbx::af::trivial_accessor> data, unsigned long n_slots=1000)

Despite

coords being 

<scitbx_array_family_flex_ext.double object at 0x7fa8d671b5b0> 

with shape 

(31294944,)

and dim being 18093576 (i.e. integer)

and 

h = flex.histogram(a, data_min=0, data_max=100, n_slots=100)

working fine in another context i.e. the calling convention is correct

This has so far cost a few hours, so what gives? How can this be holding it wrong? C++ code suggests that the bin types are long so this should be fine

Any hints?

Thanks Graeme
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