error: duplicate lang item in crate `sp_io`

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I am building a substrate based project and I see some errors when I run cargo build --release. The Toml file for runtime is given below -

runtime/Cargo.toml

[dependencies.codec]
default-features = false
features = ['derive']
package = 'parity-scale-codec'
version = '2.0.0'

[dependencies.frame-benchmarking]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
optional = true
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.1.0'

[dependencies.frame-executive]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.frame-support]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.frame-system]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.frame-system-benchmarking]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
optional = true
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.frame-system-rpc-runtime-api]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.hex-literal]
optional = true
version = '0.3.1'

[dependencies.pallet-aura]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.pallet-balances]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.pallet-grandpa]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.1.0'

[dependencies.pallet-randomness-collective-flip]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.pallet-sudo]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.pallet-carpooling]
default-features = false
path = '../pallets/carpooling'
version = '3.0.0'

[dependencies.pallet-timestamp]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.pallet-transaction-payment]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.pallet-transaction-payment-rpc-runtime-api]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-api]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-block-builder]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-consensus-aura]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '0.9.0'

[dependencies.sp-core]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-inherents]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-offchain]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-runtime]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-session]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-std]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-transaction-pool]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.sp-version]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[package]
authors = ['Substrate DevHub <https://github.com/substrate-developer-hub>']
edition = '2018'
homepage = 'https://substrate.dev'
license = 'Unlicense'
name = 'node-template-runtime'
repository = 'https://github.com/substrate-developer-hub/substrate-node-template/'
version = '3.0.0'
[package.metadata.docs.rs]
targets = ['x86_64-unknown-linux-gnu']
[build-dependencies.substrate-wasm-builder]
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '4.0.0'

# local dependencies
[dependencies]
carpooling-runtime-api = {version='3.0.0', default-features = false, path = "../pallets/carpooling/runtime-api" }

[features]
default = ['std']
runtime-benchmarks = [
    'frame-benchmarking',
    'frame-support/runtime-benchmarks',
    'frame-system-benchmarking',
    'frame-system/runtime-benchmarks',
    'hex-literal',
    'pallet-balances/runtime-benchmarks',
    'pallet-carpooling/runtime-benchmarks',
    'pallet-timestamp/runtime-benchmarks',
    'sp-runtime/runtime-benchmarks',
]
std = [
    'codec/std',
    'frame-executive/std',
    'frame-support/std',
    'frame-system-rpc-runtime-api/std',
    'frame-system/std',
    'pallet-aura/std',
    'pallet-balances/std',
    'pallet-grandpa/std',
    'pallet-randomness-collective-flip/std',
    'pallet-sudo/std',
    'pallet-carpooling/std',
    'pallet-timestamp/std',
    'pallet-transaction-payment-rpc-runtime-api/std',
    'pallet-transaction-payment/std',
    'sp-api/std',
    'sp-block-builder/std',
    'sp-consensus-aura/std',
    'sp-core/std',
    'sp-inherents/std',
    'sp-offchain/std',
    'sp-runtime/std',
    'sp-session/std',
    'sp-std/std',
    'sp-transaction-pool/std',
    'sp-version/std',
    'carpooling-runtime-api/std'
]

The Errors that I see are given below.

 error: duplicate lang item in crate `sp_io` (which `sp_application_crypto` depends on): `panic_impl`.
    |
    = note: the lang item is first defined in crate `sp_io` (which `frame_support` depends on)
    = note: first definition in `sp_io` loaded from /home/knoldus/Project/Carpooling-Chain/target/release/wbuild/node-template-runtime/target/wasm32-unknown-unknown/release/deps/libsp_io-45b30cc25a28bf9d.rmeta
    = note: second definition in `sp_io` loaded from /home/knoldus/Project/Carpooling-Chain/target/release/wbuild/node-template-runtime/target/wasm32-unknown-unknown/release/deps/libsp_io-0d2b8d6c1590e857.rmeta

  error: duplicate lang item in crate `sp_io` (which `sp_application_crypto` depends on): `oom`.
    |
    = note: the lang item is first defined in crate `sp_io` (which `frame_support` depends on)
    = note: first definition in `sp_io` loaded from /home/knoldus/Project/Carpooling-Chain/target/release/wbuild/node-template-runtime/target/wasm32-unknown-unknown/release/deps/libsp_io-45b30cc25a28bf9d.rmeta
    = note: second definition in `sp_io` loaded from /home/knoldus/Project/Carpooling-Chain/target/release/wbuild/node-template-runtime/target/wasm32-unknown-unknown/release/deps/libsp_io-0d2b8d6c1590e857.rmeta

pallets/carpooling/Cargo.toml

[dev-dependencies.sp-core]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'


[dev-dependencies.sp-runtime]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'
[dependencies.codec]
default-features = false
features = ['derive']
package = 'parity-scale-codec'
version = '2.0.0'

[dependencies.frame-benchmarking]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
optional = true
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.1.0'

[dependencies.frame-support]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[dependencies.frame-system]
default-features = false
git = 'https://github.com/paritytech/substrate.git'
rev = 'd6c33e7ec313f9bd5e319dc0a5a3ace5543f9617'
version = '3.0.0'

[features]
default = ['std']
runtime-benchmarks = ['frame-benchmarking']
std = [
    'codec/std',
    'frame-support/std',
    'frame-system/std',
    'frame-benchmarking/std',
]
try-runtime = ['frame-support/try-runtime']

[package]
authors = ['Substrate DevHub <https://github.com/substrate-developer-hub>']
description = 'FRAME pallet template for defining custom runtime logic.'
edition = '2018'
homepage = 'https://substrate.dev'
license = 'Unlicense'
name = 'pallet-carpooling'
readme = 'README.md'
repository = 'https://github.com/substrate-developer-hub/substrate-node-template/'
version = '3.0.0'
[package.metadata.docs.rs]
targets = ['x86_64-unknown-linux-gnu']

Can anyone help me out in this?

toml substrate rust-cargo rust runtime
3 Answers

Solution for me was to add this to lib.rs:

#![cfg_attr(not(feature = "std"), no_std)]
user_38067950

I think you should uncomment one of your customized pallet in runtime config like Template:pallet-template::{Pallet,Call,Storage,Event<T>}and cargo check again so that you can check what is modified pallet causing error. Or can you show all Cargo.toml of customized pallet. I'll help you.

user_126808540

Typically this means you have multiple versions of the same substrate dependencies upstream. As a first step, make sure all cargo.toml files have the same semver compatible version (ideally the same exactly). Then do a cargo clean and remove the cargo.lock file. Try to build again. If still not working, you may need to update specific packages manually via cargo update -p foo -p bar

user_97848750
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