Got error: ModuleNotFoundError: No module named 'amzsear.amzsear'

[git4sun]

Traceback (most recent call last):
  File "/Users/xxxx/lib/python3.6/site-packages/amzsear/__init__.py", line 2, in <module>
    from amzsear.core.AmzSear import AmzSear
 File "/Users/xxx/lib/python3.6/site- 
 packages/amzsear/core/AmzSear.py", line 1, in <module>
       from lxml import html as html_module
ModuleNotFoundError: No module named 'lxml'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/xxxx/items.py", line 1, in <module>
    from amzsear import AmzSear
  File "/Users/xxxx/lib/python3.6/site-packages/amzsear/__init__.py", line 4, in <module>
   from .amzsear.core.AmzSear import AmzSear
ModuleNotFoundError: No module named 'amzsear.amzsear'