builder for '/nix/store/3iwy0v935l5g8q8ggw6sgravncsjlq69-python2.7-flake8-4.0.1.drv' failed with exit code 1

cannot build derivation '/nix/store/6ckahsfycginmmjhzk8yfxf1j0rxphvw-python2.7-html5lib-1.1.drv': 1 dependencies couldn't be built
building '/nix/store/q969hll6hpjwz47i7l3669xafq8dzhd3-python2.7-olefile-0.46.drv'...
cannot build derivation '/nix/store/6n0nclmw1275qwis27yxxdx8zc91p91m-python2.7-sphinx-1.8.5.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/l8zjlpbk3l6lcjc788gx2p86cjkg5dir-python2.7-arrow-0.17.0.drv': 1 dependencies couldn't be built
building '/nix/store/vh3q859xljmnxmybwkah7pfcmvpc0451-python2.7-pyroma-2.6.1.drv'...
cannot build derivation '/nix/store/9w5ld179l8w0iyff57ws3flszpph1fyy-python2.7-construct-2.10.54.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/r18kc25n6ak41zix5yrld688r5lgwa59-python2.7-brotlipy-0.7.0.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/sqnfrh6apyrdy2cnkrhan4i16n7cirrn-python2.7-httpbin-0.7.0.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/83knpz4yzpbjlg698bcs33yhkjczq84c-python2.7-pytest-httpbin-1.0.0.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/50k88ikb7k805q7ls9i8pls2mwa8r7hp-python2.7-vcrpy-3.0.0.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/xn2qqm6hpmbnrdqxx29jgxf3kqvdsra9-python2.7-datadog-0.42.0.drv': 1 dependencies couldn't be built
cannot build derivation '/nix/store/zshvfjp2hqrybhsyc0lg6dzm2mdmy4ds-nixops-1.7.drv': 1 dependencies couldn't be built