Error on import kivent_core

[leotada]

Python 3.6
Fedora Linux 27 x64

 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "/home/leonardo/Projetos/kivent-teste/kivent/modules/core/kivent_core/__init__.py", line 7, in <module>
     from kivent_core import memory_handlers
   File "/home/leonardo/Projetos/kivent-teste/kivent/modules/core/kivent_core/memory_handlers/__init__.py", line 1, in <module>
     from kivent_core.memory_handlers import block
 ImportError: cannot import name 'block'