Warning: importing 'simtk.openmm' is deprecated.  Import 'openmm' instead.
Traceback (most recent call last):
  File "/home/ylinb/anaconda3/envs/OpenFFCrystal/bin/ForceBalance.py", line 45, in Run_ForceBalance
    optimizer.Run()
  File "/home/ylinb/anaconda3/envs/OpenFFCrystal/lib/python3.8/site-packages/forcebalance/optimizer.py", line 325, in Run
    xk = self.OptTab[self.jobtype]()
KeyError: 'optimize'