Your global Angular CLI version (10.2.0) is greater than your local version (10.1.7). The local Angular CLI version is used code example
Example 1: Your global Angular CLI version is greater than your local version
# Install npm-check-updates
$ npm i -g npm-check-updates
# Run npm-check-updates with -u, will upgrade package.json
$ ncu -u
# Install updated packages
$ npm install
Example 2: Global Angular CLI version greater than local version
npm install --save-dev @angular/cli@latest