Login error using oj from M1 MaC

[yushikmr]

Summary / 概要

when I try to login to atcoder with using online-judge-tools from M1 Mac,
the error occurred.

[NETWORK] GET: https://atcoder.jp/contests/agc001/submit
[NETWORK] 200 OK
[ERROR] Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

Steps to reproduce / 再現方法

1. run conda create -n myenv python=3.8.5
2. run conda activate myenv
3. pip install online-judge-tools

environments:

• M1 Mac
• conda 4.13.0
• python=3.8.5
• online-judge-tools==11.5.1

online-judge-tools 11.5.1 (+ online-judge-api-client 10.10.1)

Expected behavior / 期待される挙動

[NETWORK] 200 OK
[SUCCESS] You have already signed in.

Actual behavior / 実際の挙動

[NETWORK] GET: https://atcoder.jp/contests/agc001/submit
[NETWORK] 200 OK
[ERROR] Couldn't find a tree builder with the features you requested: lxml. Do you need to install a parser library?

Other notes / その他

I can login when I use pyenv & python venv. The error occurs in only when I use conda.

[cai-lw]

Have you tried pip3 install lxml as it suggests?