unable to access 'https://github.com/Cancerhjh/tmall_springboot.git/': SSL certificate problem: unable to get local issuer certificate

This error message indicates that there is an issue with the SSL certificate for the GitHub repository you are trying to access. The SSL certificate is used to establish a secure connection between your computer and the GitHub server.

There are a few possible reasons why you might be encountering this error:

1. The SSL certificate may be expired or invalid.
2. Your computer's clock may be set incorrectly, causing the SSL certificate to appear as expired.
3. Your computer may not have the necessary root certificates installed to validate the GitHub SSL certificate.

To resolve this issue, you can try the following steps:

1. Ensure that your computer's clock is set correctly.
2. Install the latest updates for your operating system and web browser.
3. Try accessing the GitHub repository using a different web browser.
4. Install the latest version of Git on your computer.
5. Add the following line to your Git configuration file:

[http]
sslVerify = false

Note: This option disables SSL certificate validation, which can be a security risk.

If none of these steps resolve the issue, you may need to contact GitHub support for further assistance.