I’ve just got the very same error: --8<---------------cut here---------------start------------->8--- downloading from https://berlin.guixsd.org/nar/gzip/iql35g1g5q9dkap5splc7f9ggskr31vl-NamesList.txt... Backtrace: In guix/scripts/package.scm: 913:10 19 (_) In guix/status.scm: 600:4 18 (call-with-status-report _ _) In guix/scripts/package.scm: 921:14 17 (_) 873:19 16 (process-actions # _) 598:4 15 (options->installable ((upgrade . #f) (verbosity . 0) (graft? . #t) (substitutes? . #t) (# . #t) # # …) …) In srfi/srfi-1.scm: 501:18 14 (fold-right # _ _ . _) In guix/scripts/package.scm: 238:37 13 (transaction-upgrade-entry _ #< install: (#< name: "qtractor" ve…>) In guix/packages.scm: 881:14 12 (cache! # # (. #) _) In unknown file: 11 (_ # # #) In guix/grafts.scm: 303:4 10 (graft-derivation # # …) 181:4 9 (references-oracle # #) 190:20 8 (_ _ _) In guix/store.scm: 1100:15 7 (_ # _ _) 661:13 6 (process-stderr _ _) In unknown file: 5 (display "@ download-progress /gnu/store/iql35g1g5q9dkap5splc7f9ggskr31vl-NamesList.txt https://berli…" …) In guix/status.scm: 521:16 4 (write! _ _ _) 439:6 3 (_ (download-progress "/gnu/store/iql35g1g5q9dkap5splc7f9ggskr31vl-NamesList.txt" "https://berlin.…" …) …) In guix/progress.scm: 208:33 2 (display-download-progress _ _ #:start-time _ #:transferred _ #:log-port _) 183:12 1 (progress-bar _ _) In unknown file: 0 (make-string -51 #\space) ERROR: In procedure make-string: Value out of range 0 to 18446744073709551615: -51 --8<---------------cut here---------------end--------------->8--- I do not have a local log file for the download of that file. “guix build --log-file /gnu/store/iql35g1g5q9dkap5splc7f9ggskr31vl-NamesList.txt” prints “https://mirror.hydra.gnu.org/log/iql35g1g5q9dkap5splc7f9ggskr31vl-NamesList.txt”. -- Ricardo