(@v1.6) pkg> add OMJulia
Installing known registries into C:\Users\Lenovo\.julia
Cloning registry from “GitHub - JuliaRegistries/General: The official registry of general Julia packages”
ERROR: failed to clone from GitHub - JuliaRegistries/General: The official registry of general Julia packages, error: GitError(Code:ERROR, Class:Net, malformed URL ‘proxyHost:proxyPort’)
遇到过类似问题，两种可能，网络或julia的问题，我是直接重新安装和设置了julia和git，然后就好了。