Hello,

I just upgraded from 2.0 to 2.2 and now encounter an error that I'm unable to fix.

  File "angle.py", line 64, in get_conformations
    cs = sampler.create_sample()
  File "/usr/lib64/python2.6/site-packages/IMP/kernel/__init__.py", line 4106, in create_sample
    return _IMP_kernel.Sampler_create_sample(self)
_IMP_base.UsageException: Usage check failure: No optimized particles found
Context: MCCG Sampler 0::create_sample/MCCG Sampler 0::do_sample


The code is pretty straightforward,

sampler = IMP.core.MCCGSampler(m)
sampler.set_bounding_box(bb)
sampler.set_number_of_conjugate_gradient_steps(1000)
sampler.set_number_of_monte_carlo_steps(1000)
sampler.set_number_of_attempts(10)
cs = sampler.create_sample


What can I change to make this run again on 2.2?

Thank you for your time,
--
Joseph D. Eschweiler