The problem persists

problem.console

[root@nixos-avaq-pi:/]# nix-channel --list
nixos https://nixos.org/channels/nixos-19.03

[root@nixos-avaq-pi:/]# nixos-version 
19.03.172807.b2ec3b6db2b (Koi)

[root@nixos-avaq-pi:/]# uname -a
Linux nixos-avaq-pi 4.19.48 #1-NixOS SMP Tue Jun 4 06:02:35 UTC 2019 aarch64 GNU/Linux

[root@nixos-avaq-pi:/]# nix-info -m
 - system: `"aarch64-linux"`
 - host os: `Linux 4.19.48, NixOS, 19.03.172807.b2ec3b6db2b (Koi)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.2.2`
 - channels(root): `"nixos-19.03.172807.b2ec3b6db2b"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

[root@nixos-avaq-pi:/]# /nix/var/nix/profiles/system/bin/switch-to-configuration
/nix/var/nix/profiles/system/bin/switch-to-configuration: line 3: use: command not found
/nix/var/nix/profiles/system/bin/switch-to-configuration: line 4: use: command not found
/nix/var/nix/profiles/system/bin/switch-to-configuration: line 5: use: command not found
/nix/var/nix/profiles/system/bin/switch-to-configuration: line 6: use: command not found
/nix/var/nix/profiles/system/bin/switch-to-configuration: line 7: use: command not found
/nix/var/nix/profiles/system/bin/switch-to-configuration: line 8: syntax error near unexpected token `('
/nix/var/nix/profiles/system/bin/switch-to-configuration: line 8: `use Sys::Syslog qw(:standard :macros);'