Nix-shell failing on lens-lib-lens-4.19.2.drv

I clone the plutus repo and ran nix-shell … this ran for a number of hours and then failed with the following output:

zcyridhi051675splnihx5myd7599wd4-stylish-haskell-exe-stylish-haskell-’, ‘/nix/store/ziifb1divbpabkg3dqkv1c0qi0bdhsnj-smallcheck-lib-smallcheck-1.2.1.drv’, ‘/nix/store/zivnf3s09nf4l0zk8wi6gxr5s6av7x43-pipes-lib-pipes-4.3.15.drv’, ‘/nix/store/zp3asyqhf3538a7x9cc5a3sb8xb2hjkc-tasty-hedgehog-lib-tasty-hedgehog-’, ‘/nix/store/zrpl73lc2r6jrirr6iiyasrw3wq7nhhh-aeson-pretty-lib-aeson-pretty-0.8.8.drv’, ‘/nix/store/zz4g2mrn5cf93k44d5fa4ivn6mfbc983-lens-lib-lens-4.19.2.drv’ failed

It’s my 1st time using nix-shell so there’s probably something I’m doing wrong.

Any guidance would be appreciated.

Tried again on another branch … following details in the pioneer program

git checkout 3746610e53654a1167aeb4c6294c6096d16b0502

This looks like where the failure started .....

curl: (22) The requested URL returned error: 404 Not Found

error: cannot download download_file?file_path=purty-6.2.0-osx.tar.gz from any mirror

builder for '/nix/store/h5r5c5d2hq01xkdppsic3bl6qacc3wqj-download_file?file_path=purty-6.2.0-osx.tar.gz.drv' failed with exit code 1

building '/nix/store/3dxxmkwxxvznc0nycmp79vcaqiqrfkda-data-default-instances-dlist-lib-data-default-instances-dlist-0.0.1-ghc-'...

cannot build derivation '/nix/store/w2j8cjba5cq80q8874c5zy2n4p6cjn11-purty-6.2.0.drv': 1 dependencies couldn't be built



Have you figured it out?

yes, thanks, I had not seen the section called " How to set up the IOHK binary caches" in the Plutus readme. Once I added the nix.conf with those line items it seemed to resolve the issue. Thank you.