**Describe the bug** The `.xml` file which I used include cloth (`composite`). If I render the model,like ``` viewer = MjViewer(sim) viewer.render() ``` It will come out the bug below **Expected behavior** I really want to use the Deformable objects in simulation. and I want to observe what happened by render **Error Messages** ``` Creating window glfw Segmentation fault (core dumped) ``` **Desktop:** - OS: ubuntu 16.04 - Python Version: 3.6.7 - Mujoco Version : 200 - mujoco-py version : 2.0.2.0a1 **Environment** - output of: `echo $LD_LIBRARY_PATH` /home/hsk/.mujoco/mujoco200/bin - output of: `echo $HOME` /home/hsk - output of: `echo $USER` hsk