Nixos channel update fails with the error error: unable to download '"': URL using bad/illegal format or missing URL (3)

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➜ ~ sudo nix-channel --update
error: unable to download ‘"’: URL using bad/illegal format or missing URL (3)
➜ ~

On Running sudo nix-channel lisst I get:
➜ ~ sudo nix-channel --list
" "
nixos nixos-unstable release nixos-24.05pre582649.d934204a0f8d
➜ ~

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Thanks. I am really grateful.