Neo4j Swift（THO）依赖图解析问题

我在将Neo4j Theo SDK依赖项安装到Vapor 3项目（Swift 4.2）中时遇到问题。我已将Package.swift文件配置为：

// swift-tools-version:4.2
import PackageDescription
let package = Package(
...
    dependencies: [
        .package(url: "https://github.com/vapor/vapor.git", from: "3.3.1"),
        .package(url: "https://github.com/vapor/fluent.git", from: "3.2.1"),
        .package(url: "https://github.com/vapor/fluent-postgresql.git", from: "1.0.0"),
        .package(url: "https://github.com/vapor/auth.git", from: "2.0.4"),
        .package(url: "https://github.com/vapor/console.git", from: "3.1.1"),
        .package(url: "https://github.com/vapor-community/pagination.git", from: "1.0.9"),
        .package(url: "https://github.com/Jinxiansen/Guardian.git", from: "3.0.0"),
        .package(url: "https://github.com/SwiftyBeaver/SwiftyBeaver-Vapor.git", from: "1.1.0"),
        .package(url: "https://github.com/SwiftyBeaver/SwiftyBeaver.git", .exact("1.6.0")),
        .package(url: "https://github.com/Neo4j-Swift/Neo4j-Swift.git", .exact("4.0.2")),
    ],
...
)

但是，当我尝试获取Swift依赖项时，我收到以下错误：

Updating https://github.com/Neo4j-Swift/Neo4j-Swift.git
error: dependency graph is unresolvable; found these conflicting requirements:
Dependencies: 
    https://github.com/Neo4j-Swift/Neo4j-Swift.git @ 4.0.2

---

我想知道我做错了什么？我还尝试了最新版本的Theo（Swift 5.0），但收到了相同的错误。如果您能帮助将Theo软件包集成到SPM项目中，我们将不胜感激。

这就是全部错误吗？如果您执行

swift build——启用pubgrub解析器

，您通常会收到关于冲突依赖项的更好的错误消息