由于框架依赖性错误,无法生成rust的火箭项目

我在跟踪 this tutorial here Rocket's official guide 建立一个网络服务器。

每晚 建立。但我得到了以下错误:

error: failed to select a version for the requirement `ring = "^0.11.0"`
  candidate versions found which didn't match: 0.16.11, 0.16.10, 0.16.9, ...
  location searched: crates.io index
required by package `cookie v0.9.1`
    ... which is depended on by `rocket v0.3.6`
    ... which is depended on by `my-project`

很明显,依赖关系有些不匹配,但是 ring 是框架本身所需要的,我不知道如何调试。。。此外,我使用的是最新版本的《货与锈》:

cargo 1.43.0-nightly (... 2020-02-18)
rustc 1.43.0-nightly (... 2020-02-21)