Have you deleted package-lock.json file? don't worry Run below command to generate package-lock.json file in your folder. npm i --package-lock-only The package-lock.json is solely used to lock dependencies to a specific version number. So that when teammates clone your work their dependency versions are the same as yours, or vice versa."npm ci" command, which will install the exact versions listed in package-lock. json "npm i" command install the version-ranges given in package cases | npm install | npm ci --------------------------------------|-------------|------------- needs package.json | no | yes needs package-lock.json | no | yes installs from package.json | yes | no installs from package-lock.json | no | yes compares both | no | yes updates loose package versions | yes | no updates loose dependencies | yes | no writes to package.json | yes | no writes to package-lock.json | yes | no deletes node_modules before install | no | yes used for installing separate package | yes | no should be used on build systems / CI | no | yes can be used for development | yes | yes reproducible installs | no | yes[Solved] npm WARN old lockfile The package-lock.json file was created with an old version of npm