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我正在帮助某人在Windows 7中运行npm。当执行npm更新时，会返回以下错误（ENOENT，scandir）。但是npm无法找到的文件夹已被验证存在，并且运行npm的用户对该文件夹拥有完全权限。下面是这个错误的npm-debug.log的详细信息：npm Windows 7错误
18265 silly fetchPackageMetaData errno: -4058,
18265 silly fetchPackageMetaData code: 'ENOENT',
18265 silly fetchPackageMetaData syscall: 'scandir',
18265 silly fetchPackageMetaData path: 'C:\\Users\<\userpath\>\\npm-cache\\_git-remotes\\git-github-com-polymerelements-test-fixture-git-8142662e\\HEAD' }
18266 silly rollbackFailedOptional Starting
18267 silly rollbackFailedOptional Finishing
18268 silly runTopLevelLifecycles Finishing
18269 silly install printInstalled
18270 verbose stack Error: ENOENT: no such file or directory, scandir 'C:\Users\\<userpath\>\npm-cache\_git-remotes\git-github-com-polymerelements-test-fixture-git-8142662e\HEAD'
18271 verbose cwd C:\Users\\<userpath\>\git\PredixDev\predix-seed
18272 error Windows_NT 6.1.7601
18273 error argv "G:\\nodejs\\node.exe" "G:\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "update" "--no-optional"
18274 error node v7.2.0
18275 error npm v3.10.9
18276 error path C:\Users\\<userpath\>\npm-cache\_git-remotes\git-github-com-polymerelements-test-fixture-git-8142662e\HEAD
18277 error code ENOENT
18278 error errno -4058
18279 error syscall scandir
18280 error enoent ENOENT: no such file or directory, scandir 'C:\Users\\<userpath\>\npm-cache\_git-remotes\git-github-com-polymerelements-test-fixture-git-8142662e\HEAD'
18281 error enoent ENOENT: no such file or directory, scandir 'C:\Users\\<userpath\>\npm-cache\_git-remotes\git-github-com-polymerelements-test-fixture-git-8142662e\HEAD'
18281 error enoent This is most likely not a problem with npm itself
18281 error enoent and is related to npm not being able to find a file.
18282 verbose exit [ -4058, true ]
我对使用Windows上的节点并不熟悉。请帮忙，谢谢。 （注意：我已用\替换了特定的用户文件夹信息以清理信息。）