INFO Starting development server…. ERROR Error: Rule can only have one resource source (provided

when writing a Vue cli project, the following problems occurred when running NPM run serve

after consulting the data, you know that you have installed the latest version of SASS loader, which may be because the version is too new, Incompatible with project plug-ins or dependencies

in the terminal, delete the newer version NPM uninstall sass loader
install the lower version NPM install sass- [email protected] –save-dev

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