locking this thread to CPU 1
querying info about missing paths...
starting pool of 3 threads
checking substituter 'https://cache.kassir.io' for path '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2'
checking substituter 'https://cache.kassir.io' for path '/nix/store/aj8yk779bng82q1z6a0i6mn2sv590dxm-nix-2.0.4'
checking substituter 'https://cache.kassir.io' for path '/nix/store/glvf65ybj1z1xnpmfcv8w3qx0v35adm6-nix-prefetch-scripts'
checking substituter 'https://cache.kassir.io' for path '/nix/store/inzn7zs4vqvc9cbdvx5avqh8lkdxv66d-aws-sdk-cpp-1.4.78'
checking substituter 'https://cache.kassir.io' for path '/nix/store/k6sbkhsp8awxhmjyjjndlndh8hq0w351-nix-2.0.4-man'
checking substituter 'https://cache.kassir.io' for path '/nix/store/91hyb5vjnx605ic9gzaawhp3jwh9iwzw-boehm-gc-7.6.6'
checking substituter 'https://cache.kassir.io' for path '/nix/store/f5hj9zvqg19pds1xdghaf7vlrlbviidl-nix-prefetch-svn'
checking substituter 'https://cache.kassir.io' for path '/nix/store/lwb5ka54azhn4shgkp7k411fw287v1xh-nix-prefetch-bzr'
checking substituter 'https://cache.kassir.io' for path '/nix/store/z66aa1sn9jxdx54jz0x9ywy08hc4mmkv-nix-prefetch-git'
checking substituter 'https://cache.kassir.io' for path '/nix/store/8hkg8kb4kyq6sq3xn20frz5z036m936s-nix-prefetch-hg'
checking substituter 'https://cache.kassir.io' for path '/nix/store/yjifn6k32ggxrjbqh04lnwzkqlmi2hyr-nix-prefetch-cvs'
reaping 3 worker threads
these paths will be fetched (0.00 MiB download, 21.24 MiB unpacked):
  /nix/store/8hkg8kb4kyq6sq3xn20frz5z036m936s-nix-prefetch-hg
  /nix/store/91hyb5vjnx605ic9gzaawhp3jwh9iwzw-boehm-gc-7.6.6
  /nix/store/aj8yk779bng82q1z6a0i6mn2sv590dxm-nix-2.0.4
  /nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2
  /nix/store/f5hj9zvqg19pds1xdghaf7vlrlbviidl-nix-prefetch-svn
  /nix/store/glvf65ybj1z1xnpmfcv8w3qx0v35adm6-nix-prefetch-scripts
  /nix/store/inzn7zs4vqvc9cbdvx5avqh8lkdxv66d-aws-sdk-cpp-1.4.78
  /nix/store/k6sbkhsp8awxhmjyjjndlndh8hq0w351-nix-2.0.4-man
  /nix/store/lwb5ka54azhn4shgkp7k411fw287v1xh-nix-prefetch-bzr
  /nix/store/yjifn6k32ggxrjbqh04lnwzkqlmi2hyr-nix-prefetch-cvs
  /nix/store/z66aa1sn9jxdx54jz0x9ywy08hc4mmkv-nix-prefetch-git
querying info about missing paths...
starting pool of 3 threads
checking substituter 'https://cache.kassir.io' for path '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2'
checking substituter 'https://cache.kassir.io' for path '/nix/store/aj8yk779bng82q1z6a0i6mn2sv590dxm-nix-2.0.4'
checking substituter 'https://cache.kassir.io' for path '/nix/store/glvf65ybj1z1xnpmfcv8w3qx0v35adm6-nix-prefetch-scripts'
checking substituter 'https://cache.kassir.io' for path '/nix/store/91hyb5vjnx605ic9gzaawhp3jwh9iwzw-boehm-gc-7.6.6'
checking substituter 'https://cache.kassir.io' for path '/nix/store/8hkg8kb4kyq6sq3xn20frz5z036m936s-nix-prefetch-hg'
checking substituter 'https://cache.kassir.io' for path '/nix/store/f5hj9zvqg19pds1xdghaf7vlrlbviidl-nix-prefetch-svn'
checking substituter 'https://cache.kassir.io' for path '/nix/store/inzn7zs4vqvc9cbdvx5avqh8lkdxv66d-aws-sdk-cpp-1.4.78'
checking substituter 'https://cache.kassir.io' for path '/nix/store/lwb5ka54azhn4shgkp7k411fw287v1xh-nix-prefetch-bzr'
checking substituter 'https://cache.kassir.io' for path '/nix/store/yjifn6k32ggxrjbqh04lnwzkqlmi2hyr-nix-prefetch-cvs'
checking substituter 'https://cache.kassir.io' for path '/nix/store/z66aa1sn9jxdx54jz0x9ywy08hc4mmkv-nix-prefetch-git'
checking substituter 'https://cache.kassir.io' for path '/nix/store/k6sbkhsp8awxhmjyjjndlndh8hq0w351-nix-2.0.4-man'
reaping 3 worker threads
substitution of '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2': created
substitution of '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2': woken up
entered goal loop
substitution of '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2': init
acquiring global GC lock '/nix/var/nix/gc.lock'
acquiring read lock on '/nix/var/nix/temproots/7229'
acquiring write lock on '/nix/var/nix/temproots/7229'
downgrading to read lock on '/nix/var/nix/temproots/7229'
substitution of '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2': trying next substituter
warning: substituter 'https://cache.kassir.io' does not have a valid signature for path '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2'
substitution of '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2': trying next substituter
path '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2' is required, but there is no substituter that can build it
substitution of '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2': done
substitution of '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2': goal destroyed
error: build of '/nix/store/aqhld814irl57k6fbj5szh4ds4hkzai0-cabal2nix-2.9.2' failed