下载官方demo，执行后报错

[ikimiler]

_dll.android.bundle 也是空文件
warning: failed to load the preRefPath correctly! are you setting the "dll.referenceDir" correctly?
warning: failed to load the dllRefPath correctly! are you setting the "dll.referenceDir" correctly?
info Writing bundle output to:, public/dll/_dll.ios.bundle
info Done writing bundle output
warn Assets destination folder is not set, skipping...
Welcome to Metro!
Fast - Scalable - Integrated

warning: failed to load the preRefPath correctly! are you setting the "dll.referenceDir" correctly?
warning: failed to load the dllRefPath correctly! are you setting the "dll.referenceDir" correctly?
info Writing bundle output to:, public/dll/_dll.android.bundle
info Done writing bundle output
warn Assets destination folder is not set, skipping...
npm notice
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npm notice Run npm install -g [email protected] to update!