GCEのあるPythonプログラムを実行するとImportエラーとなる

前提・実現したいこと

GCEのあるPythonプログラムを実行。実行するコマンドは以下

python
1sudo python3 webhook.py

発生している問題・エラーメッセージ

このようなエラーが表示されており、前に進めません。
どなたか回避方法をご存知でしたら、ご確認願います。

During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "webhook.py", line 6, in <module>
import core
File "/home/shota.k/project/core.py", line 3, in <module>
import lib.git as git_func
File "/home/shota.k/project/lib/git.py", line 4, in <module>
from git import Repo
File "/home/shota_k/.local/lib/python3.5/site-packages/git/__init__.py", line 85, in <module>
raise ImportError('Failed to initialize: {0}'.format(exc))
ImportError: Failed to initialize: Bad git executable.
The git executable must be specified in one of the following ways:
- be included in your $PATH
- be set via $GIT_PYTHON_GIT_EXECUTABLE
- explicitly set via git.refresh()
All git commands will error until this is rectified.
This initial warning can be silenced or aggravated in the future by setting the
$GIT_PYTHON_REFRESH environment variable. Use one of the following values:
- quiet|q|silence|s|none|n|0: for no warning or exception
- warn|w|warning|1: for a printed warning