Permission denied (publickey). fatal: Could not read from remote repository.

　　博主在github上下载tiny face的的源代码的时候，遇到git clone命令为：git clone --recursive git@github.com:peiyunh/tiny.githtml 　　而当我在ternimal下执行这条语句的时候，出现错误：git 　　Permissiondenied (publickey).github 　　fatal:Could not read

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