vue-element-admin - After cloning the project, npm install package reported an error: code 128 An unknown git error occurred (perfect solution, 100% solved!)

Problem Description

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When cloning the vue-element-admin project, the following error occurred when npm install packaged it.

npm ERR! code 128
npm ERR! An unknown git error occurred
npm ERR! command git --no-replace-objects ls-remote ssh://[email protected]/nhn/raphael.git
npm ERR! [email protected]: Permission denied (publickey).
npm ERR! fatal: Could not read from remote repository.
npm ERR!
npm ERR! Please make sure you have the correct access rights
npm ERR! and the repository exists.