由于日志版本的原因，无法添加托盘刻度

Question

我正在学习基础知识和

我只是在学习一些教程。

在第二个教程(https://substrate.dev/docs/en/tutorials/add-a-pallet/import-a-pallet)中，由于下面的错误，我无法继续。

Execution failed (exit code 101).
/Users/~~~/.cargo/bin/cargo metadata --verbose --format-version 1 --all-features
stdout :     Updating git repository `https://github.com/paritytech/substrate.git`
    Updating crates.io index
error: failed to select a version for `log`.
    ... required by package `frame-support v3.0.0 (https://github.com/paritytech/substrate.git?tag=monthly-2021-05#70ef0afc)`
    ... which is depended on by `pallet-nicks v3.0.0 (https://github.com/paritytech/substrate.git?tag=monthly-2021-05#70ef0afc)`
    ... which is depended on by `node-template-runtime v3.0.0 (/Users/~~~/projects/substrate-node-template/runtime)`
    ... which is depended on by `node-template v3.0.0 (/Users/~~~/projects/substrate-node-template/node)`
versions that meet the requirements `^0.4.14` are: 0.4.14

all possible versions conflict with previously selected packages.

  previously selected package `log v0.4.13`
    ... which is depended on by `finality-grandpa v0.13.0`
    ... which is depended on by `sc-finality-grandpa v0.9.0`
    ... which is depended on by `node-template v3.0.0 (/Users/~~~/projects/substrate-node-template/node)`

failed to select a version for `log` which could resolve this conflict

stderr : 

当我在运行时/Cargo.toml上添加了关于教程内容的托盘-记号和特性时，就会发生这种情况。

在此之前，一切都很好。

Answer 1

我找到了一个解决方法，就是在cargo.toml上手动添加日志依赖，如下所示

# cargo.toml
log = '^0.4.14'

它是正常的，但是在下一步之后我遇到了另一个问题(它在配置后无法构建)，所以我只使用了答案分支(add-a-pallet-v3.0.0+monthly-2021-05)，它是正常的……

Answer 2

我遇到了同样的错误。解决方法是:在您的cargo.toml中，不要添加："pallet-nicks ={ default-features = false，version = '3.0.0'，git = 'https://github.com/paritytech/substrate.git'，tag = 'monthly-2021-05‘}“，只需添加"pallet-nicks ={ default-features = false，version = '3.0.0'}”即可。