**while creating prefix:css for autoprefixer for my project i get this error please help me**

[mukundlalge]

npm run prefix:css

natours@1.0.0 prefix:css

_F:\MyProject

postcss --use autoprefixer -b 'last 10 versions' css/style.concat.css -o css/style.prefix.css

TypeError: Patterns must be a string or an array of strings
at assertPatternsInput (F:\MyProject\node_modules\globby\index.js:15:9)
at generateGlobTasks (F:\MyProject\node_modules\globby\index.js:21:2)
at module.exports (F:\MyProject\node_modules\globby\index.js:73:15)
at Promise.resolve.then (F:\MyProject\node_modules\postcss-cli\index.js:55:39)
at
at process._tickCallback (internal/process/next_tick.js:160:7)
at Function.Module.runMain (module.js:703:11)
at startup (bootstrap_node.js:190:16)
at bootstrap_node.js:662:3
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! natours@1.0.0 prefix:css: postcss --use autoprefixer -b 'last 10 versions' css/style.concat.css -o css/style.prefix.css
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the natours@1.0.0 prefix:css script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Acer\AppData\Roaming\npm-cache_logs\2018-03-14T10_53_28_793Z-debug.log

error log file is:

0 info it worked if it ends with ok
1 verbose cli [ 'C:\Program Files\nodejs\node.exe',
1 verbose cli 'C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js',
1 verbose cli 'run-script',
1 verbose cli 'prefix:css' ]
2 info using npm@5.6.0
3 info using node@v9.5.0
4 verbose run-script [ 'prefix:css' ]
5 info lifecycle natours@1.0.0prefix:css: natours@1.0.0
6 verbose lifecycle natours@1.0.0prefix:css: unsafe-perm in lifecycle true
7 verbose lifecycle natours@1.0.0prefix:css: PATH: C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\node-gyp-bin;F:\MyProject\node_modules.bin;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0;C:\Program Files (x86)\Microsoft SQL Server\Client SDK\ODBC\130\Tools\Binn;C:\Program Files (x86)\Microsoft SQL Server\140\Tools\Binn;C:\Program Files (x86)\Microsoft SQL Server\140\DTS\Binn;C:\Program Files (x86)\Microsoft SQL Server\140\Tools\Binn\ManagementStudio;C:\Program Files\Microsoft SQL Server\140\Tools\Binn;C:\Program Files\Microsoft SQL Server\140\DTS\Binn;C:\Program Files\Microsoft SQL Server\Client SDK\ODBC\130\Tools\Binn;C:\Program Files\nodejs;C:\Program Files\Java\jdk1.8.0_151\bin;C:\Program Files\Microsoft VS Code\bin;C:\Users\Acer\AppData\Roaming\npm
8 verbose lifecycle natours@1.0.0prefix:css: CWD: F:\MyProject
9 silly lifecycle natours@1.0.0prefix:css: Args: [ '/d /s /c',
9 silly lifecycle 'postcss --use autoprefixer -b 'last 10 versions' css/style.concat.css -o css/style.prefix.css' ]
10 silly lifecycle natours@1.0.0prefix:css: Returned: code: 1 signal: null
11 info lifecycle natours@1.0.0~prefix:css: Failed to exec prefix:css script
12 verbose stack Error: natours@1.0.0 prefix:css: postcss --use autoprefixer -b 'last 10 versions' css/style.concat.css -o css/style.prefix.css
12 verbose stack Exit status 1
12 verbose stack at EventEmitter. (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\index.js:285:16)
12 verbose stack at EventEmitter.emit (events.js:160:13)
12 verbose stack at ChildProcess. (C:\Program Files\nodejs\node_modules\npm\node_modules\npm-lifecycle\lib\spawn.js:55:14)
12 verbose stack at ChildProcess.emit (events.js:160:13)
12 verbose stack at maybeClose (internal/child_process.js:943:16)
12 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:220:5)
13 verbose pkgid natours@1.0.0
14 verbose cwd F:\MyProject
15 verbose Windows_NT 10.0.10240
16 verbose argv "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "run-script" "prefix:css"
17 verbose node v9.5.0
18 verbose npm v5.6.0
19 error code ELIFECYCLE
20 error errno 1
21 error natours@1.0.0 prefix:css: postcss --use autoprefixer -b 'last 10 versions' css/style.concat.css -o css/style.prefix.css
21 error Exit status 1
22 error Failed at the natours@1.0.0 prefix:css script.
22 error This is probably not a problem with npm. There is likely additional logging output above.
23 verbose exit [ 1, true ]

[kenany]

Error is coming from postcss, not npm:

postcss --use autoprefixer -b 'last 10 versions' css/style.concat.css -o css/style.prefix.css

TypeError: Patterns must be a string or an array of **strings**

[42x42x42]

did you find out how to solve a problem? share your decision pls

[ploutos27]

if you're using windows: try the following:

postcss --use autoprefixer -b \"last 10 versions\" css/style.concat.css -o css/style.prefix.css

`

[42x42x42]

It's working!! Thank you! does that mean that I should replace ' ' by " "\ in package.json always in all type of command or its only postcss issue?