Models under tvb_contrib are not working

~/anaconda3/envs/tvb-run/lib/python3.7/site-packages/tvb/contrib/simulator/models/morris_lecar.py in __init__(self, **kwargs) 178 179 """ --> 180 LOG.info('%s: initing...' % str(self)) 181 super(MorrisLecar, self).__init__(**kwargs) 182 ~/anaconda3/envs/tvb-run/lib/python3.7/site-packages/tvb/basic/neotraits/_core.py in __str__(self) 183 184 def __str__(self): --> 185 return trait_object_str(self) 186 187 def _repr_html_(self): ~/anaconda3/envs/tvb-run/lib/python3.7/site-packages/tvb/basic/neotraits/info.py in trait_object_str(self) 133 def trait_object_str(self): 134 cls = type(self) --> 135 summary = self.summary_info() 136 result = ['{} ('.format(cls.__name__)] 137 maxlenk = max(len(k) for k in summary) ~/anaconda3/envs/tvb-run/lib/python3.7/site-packages/tvb/basic/neotraits/_core.py in summary_info(self) 237 cls = type(self) 238 ret = \{'Type': cls.__name__} --> 239 if self.title: 240 ret['title'] = str(self.title) 241 AttributeError: 'MorrisLecar' object has no attribute 'title'
 

import tvb.simulator.models as models
from tvb.contrib.simulator.models import morris_lecar
import numpy as np
dt=0.1
integ = integrators.HeunDeterministic(dt=dt)
oscil = morris_lecar.MorrisLecar() #variables_of_interest=['V','N'],gCa=np.array([4.]))