从 repo 运行工作流时，例如：
snakemake --use-conda -p --cluster-config cluster.yaml --cluster "qsub -l {cluster.l} -m {cluster.m} -N {cluster.N} -r {cluster.r} -V" --jobs 1
我的工作开始但遇到urllib相关错误（见下文）。我在计算服务器上运行 v3.13.3。关于如何避免这种情况的任何提示？提前致谢。
File "miniconda3/lib/python3.5/site-packages/snakemake/__init__.py", line 469, in snakemake
force_use_threads=use_threads)
File "miniconda3/lib/python3.5/site-packages/snakemake/workflow.py", line 450, in execute
dag.create_conda_envs(dryrun=dryrun)
File "miniconda3/lib/python3.5/site-packages/snakemake/dag.py", line 166, in create_conda_envs
hash = env.hash
File "miniconda3/lib/python3.5/site-packages/snakemake/conda.py", line 55, in hash
md5hash.update(self.content)
File "miniconda3/lib/python3.5/site-packages/snakemake/conda.py", line 38, in content
content = urlopen(env_file).read()
File "miniconda3/lib/python3.5/urllib/request.py", line 163, in urlopen
return opener.open(url, data, timeout)
File "miniconda3/lib/python3.5/urllib/request.py", line 466, in open
response = self._open(req, data) ...
raise URLError(err)
urllib.error.URLError: <urlopen error [Errno 101] Network is unreachable>