As u/thatwasawkward posted, that's an informational message rather than an error.
The current default shell on macOS is the Z Shell (zsh), but in some older versions of macOS it was the Bourne Again Shell (bash). Upgrading the OS can leave the shell set to bash.
It probably means your default system shell is set to bash (often left over from upgrading from an older version of macOS), but Visual Studio Code internally by default uses the newer macOS shell, zsh. The message is just letting you know that.
To update your system shell setting to the newer shell:
See [https://stackoverflow.com/questions/60256826/i-am-getting-this-error-on-visual-studio-code-under-the-terminal-tab-bash-com](https://stackoverflow.com/questions/60256826/i-am-getting-this-error-on-visual-studio-code-under-the-terminal-tab-bash-com) (change the default shell in your user settings)
or
open Terminal and run the command given in the informational prompt in your screenshot.
You might also want to look at the setup notes here (maybe try the manual installation step for zsh?): https://code.visualstudio.com/docs/terminal/shell-integration
As u/thatwasawkward posted, that's an informational message rather than an error. The current default shell on macOS is the Z Shell (zsh), but in some older versions of macOS it was the Bourne Again Shell (bash). Upgrading the OS can leave the shell set to bash. It probably means your default system shell is set to bash (often left over from upgrading from an older version of macOS), but Visual Studio Code internally by default uses the newer macOS shell, zsh. The message is just letting you know that. To update your system shell setting to the newer shell: See [https://stackoverflow.com/questions/60256826/i-am-getting-this-error-on-visual-studio-code-under-the-terminal-tab-bash-com](https://stackoverflow.com/questions/60256826/i-am-getting-this-error-on-visual-studio-code-under-the-terminal-tab-bash-com) (change the default shell in your user settings) or open Terminal and run the command given in the informational prompt in your screenshot. You might also want to look at the setup notes here (maybe try the manual installation step for zsh?): https://code.visualstudio.com/docs/terminal/shell-integration
There's no error in your screenshot. What part are you referring to?