runtime error

Cloning into 'detectron2'... fatal: unable to access 'https://github.com/facebookresearch/detectron2.git/': Could not resolve host: github.com Defaulting to user installation because normal site-packages is not writeable ERROR: detectron2 is not a valid editable requirement. It should either be a path to a local project or a VCS URL (beginning with bzr+http, bzr+https, bzr+ssh, bzr+sftp, bzr+ftp, bzr+lp, bzr+file, git+http, git+https, git+ssh, git+git, git+file, hg+file, hg+http, hg+https, hg+ssh, hg+static-http, svn+ssh, svn+http, svn+https, svn+svn, svn+file). WARNING: There was an error checking the latest version of pip. Traceback (most recent call last): File "/home/user/app/app.py", line 6, in <module> from unilm.dit.object_detection.ditod import add_vit_config File "/home/user/app/unilm/dit/object_detection/ditod/__init__.py", line 10, in <module> from .config import add_vit_config File "/home/user/app/unilm/dit/object_detection/ditod/config.py", line 1, in <module> from detectron2.config import CfgNode as CN ModuleNotFoundError: No module named 'detectron2'

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