webpack error in Cannot find module 'less'

I had the same issue. ERROR in Cannot find module 'less'

├── UNMET PEER DEPENDENCY file-loader@*
├── UNMET PEER DEPENDENCY less@^2.3.1
├── [email protected] 
└── [email protected] 
npm WARN EPEERINVALID [email protected] requires a peer of less@^2.3.1 
but none was installed.
npm WARN EPEERINVALID [email protected] requires a peer of file-loader@* 
but none was installed.

I tried as follows:

npm install --save-dev less
npm install --save-dev file-loader

Then it solved the issues.

This error happens because npm@3 does not resolve peerDependencies any more.

npm install less less-loader is the way to go.

I had the same issue with a .Net Core project. I resolved this by adding less to my package.json file as well as less-loader.

"less-loader": "2.2.3",
"less": "2.7.2"

It sounds like you haven't installed the less-loader into your node_modules. Installing it would fix this.

npm install less-loader --save-dev

Edit: Also you will get this error when you haven't installed the css-loader and style-loader that you are chaining less-loader to.

Anyone who comes across this can plus on the issue I submitted for the bad message. "Error in Cannot find module 'less'" when missing loaders chained after less. Revise error message.