Package.swift has no Package.swift manifest for version 2.1.0 in https://github.com/swiftsocket/SwiftSocket

[Naonao9527]

Package.swift has error when I run the command:swift build
0.o
PS E:\swift-projects\SocketLearn> swift run
Updating https://github.com/swiftsocket/SwiftSocket
Updated https://github.com/swiftsocket/SwiftSocket (1.21s)
Computing version for https://github.com/swiftsocket/SwiftSocket
error: /\Package.swift has no Package.swift manifest for version 2.1.0 in https://github.com/swiftsocket/SwiftSocket