Error while adding Nick Pallet to substrate - substrate

Question

I have just started exploring substrate and I am following this tutorial, (https://docs.substrate.io/tutorials/v3/add-a-pallet/).
Under step Implement the Nicks pallet Config trait -> Add Nicks to the construct_runtime! macro., I added Nicks pallet to my runtime, as shown in the screenshot.
Now, when I run cargo check -p node-template-runtime, I get a lot of errors;
asad#asad-Z440:~/Dev/Blockchain/polkadot/substrate-node-template$ cargo check -p node-template-runtime
warning: /home/asad/Dev/Blockchain/polkadot/substrate-node-template/node/Cargo.toml: version requirement `3.0.0-monthly-2021-09+1` for dependency `node-template-runtime` includes semver metadata which will be ignored, removing the metadata is recommended to avoid confusion
warning: /home/asad/Dev/Blockchain/polkadot/substrate-node-template/runtime/Cargo.toml: version requirement `3.0.0-monthly-2021-09+1` for dependency `pallet-template` includes semver metadata which will be ignored, removing the metadata is recommended to avoid confusion
Updating git repository `https://github.com/paritytech/substrate.git`
Updating crates.io index
Updating git repository `https://github.com/paritytech/substrate.git`
Compiling node-template-runtime v3.0.0-monthly-2021-09+1 (/home/asad/Dev/Blockchain/polkadot/substrate-node-template/runtime)
error: failed to run custom build command for `node-template-runtime v3.0.0-monthly-2021-09+1 (/home/asad/Dev/Blockchain/polkadot/substrate-node-template/runtime)`
Caused by:
process didn't exit successfully: `/home/asad/Dev/Blockchain/polkadot/substrate-node-template/target/debug/build/node-template-runtime-c9c48352bd7ed47e/build-script-build` (exit status: 1)
--- stdout
Information that should be included in a bug report.
Executing build command: "rustup" "run" "nightly" "cargo" "rustc" "--target=wasm32-unknown-unknown" "--manifest-path=/home/asad/Dev/Blockchain/polkadot/substrate-node-template/target/debug/wbuild/node-template-runtime/Cargo.toml" "--color=always" "--release"
Using rustc version: rustc 1.57.0-nightly (aa7aca3b9 2021-09-30)
--- stderr
warning: /home/asad/Dev/Blockchain/polkadot/substrate-node-template/runtime/Cargo.toml: version requirement `3.0.0-monthly-2021-09+1` for dependency `pallet-template` includes semver metadata which will be ignored, removing the metadata is recommended to avoid confusion
Updating git repository `https://github.com/paritytech/substrate.git`
Compiling node-template-runtime v3.0.0-monthly-2021-09+1 (/home/asad/Dev/Blockchain/polkadot/substrate-node-template/runtime)
warning: unused doc comment
--> /home/asad/Dev/Blockchain/polkadot/substrate-node-template/runtime/src/lib.rs:253:1
|
253 | /// Nicks Config:
| ^^^^^^^^^^^^^^^^^ rustdoc does not generate documentation for macro invocations
|
= note: `#[warn(unused_doc_comments)]` on by default
= help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
error: duplicate lang item in crate `sp_io` (which `frame_support` depends on): `panic_impl`.
.........
310 | / construct_runtime!(
311 | | pub enum Runtime where
312 | | Block = Block,
313 | | NodeBlock = opaque::Block,
... |
327 | | }
328 | | );
| |__^
note: required by a bound in `sp_runtime::generic::UncheckedExtrinsic`
--> /home/asad/.cargo/git/checkouts/substrate-7e08433d4c370a21/20a9bbb/primitives/runtime/src/generic/unchecked_extrinsic.rs:39:40
|
39 | pub struct UncheckedExtrinsic<Address, Call, Signature, Extra>
| ^^^^ required by this bound in `sp_runtime::generic::UncheckedExtrinsic`
= note: this error originates in the macro `construct_runtime` (in Nightly builds, run with -Z macro-backtrace for more info)
For more information about this error, try `rustc --explain E0277`.
warning: `node-template-runtime` (lib) generated 1 warning
error: could not compile `node-template-runtime` due to 112 previous errors; 1 warning emitted
Things I have tried:
Removing Cargo.lock file and then running cargo check -p node-template-runtime.
PS: I am just starting with rust and substrate, so spare me if i am asking something obvious here.