[PyMOL] Problem with Pymol 2.3.0 with 'undefined symbol: MMTF_unpack_from_string'

[<Ta...@em...>]

Dear all,

I installed the pymol on my machine with Ubuntu 18.04.1 LTS. When I  
launch pymol and error appears:

Traceback (most recent call last):
   File  
"/home/mauricetam/Documents/software/pymol-2.3.0//lib/python2.7/site-packages/pymol/__init__.py", line 64, in  
<module>
     import pymol
   File  
"/home/mauricetam/Documents/software/pymol-2.3.0/lib/python2.7/site-packages/pymol/__init__.py", line 580, in  
<module>
     import pymol._cmd
ImportError:  
/home/mauricetam/Documents/software/pymol-2.3.0/lib/python2.7/site-packages/pymol/_cmd.so: undefined symbol:  
MMTF_unpack_from_string

Any idea what is going wrong?

Thank you for your help.

Best
Heng-Keat