coilsnake-cli error

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/coilsnake-4.0-py3.7-linux-x86_64.egg/coilsnake/util/common/yml.py", line 66, in yml_load
    return yaml.load(f, Loader=yaml.CSafeLoader)
AttributeError: module 'yaml' has no attribute 'CSafeLoader'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/usr/local/bin/coilsnake-cli", line 11, in <module>
    load_entry_point('coilsnake==4.0', 'console_scripts', 'coilsnake-cli')()
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 490, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2854, in load_entry_point
    return ep.load()
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2445, in load
    return self.resolve()
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 2451, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/usr/local/lib/python3.7/site-packages/coilsnake-4.0-py3.7-linux-x86_64.egg/coilsnake/ui/cli.py", line 5, in <module>
    from coilsnake.ui.common import compile_project, decompile_rom, upgrade_project, decompile_script, create_patch, patch_rom, expand, add_header, strip_header, setup_logging
  File "/usr/local/lib/python3.7/site-packages/coilsnake-4.0-py3.7-linux-x86_64.egg/coilsnake/ui/common.py", line 12, in <module>
    from coilsnake.model.common.ips import IpsPatch
  File "/usr/local/lib/python3.7/site-packages/coilsnake-4.0-py3.7-linux-x86_64.egg/coilsnake/model/common/ips.py", line 4, in <module>
    from coilsnake.model.common.blocks import Rom
  File "/usr/local/lib/python3.7/site-packages/coilsnake-4.0-py3.7-linux-x86_64.egg/coilsnake/model/common/blocks.py", line 297, in <module>
    ROM_TYPE_MAP = yml_load(f)
  File "/usr/local/lib/python3.7/site-packages/coilsnake-4.0-py3.7-linux-x86_64.egg/coilsnake/util/common/yml.py", line 75, in yml_load
    raise CoilSnakeUnexpectedError(traceback.format_exc())
coilsnake.exceptions.common.exceptions.CoilSnakeUnexpectedError: CoilSnakeUnexpectedError: Unexpected error:
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/coilsnake-4.0-py3.7-linux-x86_64.egg/coilsnake/util/common/yml.py", line 66, in yml_load
    return yaml.load(f, Loader=yaml.CSafeLoader)
AttributeError: module 'yaml' has no attribute 'CSafeLoader'