1. An error occurs when installing less because the installed version is too high

npm ERR! code ERESOLVE
npm ERR! ERESOLVE unable to resolve dependency tree
npm ERR! 
npm ERR! While resolving: [email protected]
npm ERR! Found: [email protected]       
npm ERR! node_modules/webpack        
npm ERR!   dev webpack@"^3.6.0" from the root project
npm ERR!
npm ERR! Could not resolve dependency:
npm ERR! peer webpack@"^5.0.0" from [email protected]
npm ERR! node_modules/less-loader
npm ERR!   less-loader@"*" from the root project
npm ERR! 
npm ERR! Fix the upstream dependency conflict, or retry
npm ERR! this command with --force, or --legacy-peer-deps
npm ERR! to accept an incorrect (and potentially broken) dependency resolution.
npm ERR!
npm ERR! See C:\Users\59129\AppData\Local\npm-cache\eresolve-report.txt for a full report.

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\59129\AppData\Local\npm-cache\_logs\2021-03-19T09_05_44_385Z-debug.log

2. Error reason less this version is too high. You need to reduce the version and execute the code

Remove the previous version first: NPM uninstall less loader
download the specified version: NPM install less- [email protected] -D

3. Just restart the code. If an error is still reported, the file node can be removed_Modules, Download cnpm install again