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Getting error when creating new SPFx solution or adding a new webpart in existing SPFx solution

 I formatted my laptop and installed all fresh software on it. When I was trying to create a new SPFx solution, I was getting an error :

C:\Users\Hp\AppData\Roaming\npm\node_modules\yo\node_modules\yeoman-environment\lib\resolver.js:70

filePatterns: lookups.flatMap(prefix => [`${prefix}/*/index.ts`, `${prefix}/*/index.js`, `${prefix}/*/index.cjs`, `${prefix}/*/index.mjs`]),
^
TypeError: lookups.flatMap is not a function
at Environment.resolver.lookup (C:\Users\Hp\AppData\Roaming\npm\node_modules\yo\node_modules\yeoman-environment\lib\resolver.js:70:27)
at init (C:\Users\Hp\AppData\Roaming\npm\node_modules\yo\lib\cli.js:130:7)
at pre (C:\Users\Hp\AppData\Roaming\npm\node_modules\yo\lib\cli.js:89:3)
at Object.<anonymous> (C:\Users\Hp\AppData\Roaming\npm\node_modules\yo\lib\cli.js:219:3)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)

I tried to add new webpart in the existing solution but got same issue. Then I tried npm command :

npm list -g --depth=0

I found that by mistake I installed wrong versions :

+-- @microsoft/generator-sharepoint@1.11.0 
+-- gulp@4.0.2 
+-- yo@4.0.0

The solution is uninstall the gulp & yeoman generator:

npm uninstall -g gulp 
npm uninstall -g yo

Then install the correct version :
npm install -g gulp@3.9.1 
npm install -g yo@3.1.0

Now it is working fine.


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