Help! - App Store crashes immediately on opening

I've just resorted to reinstalling the OS which has worked.

Hi,

You've done an excellent job troubleshooting this problem. Here are some more things you can try:

• Restart your Mac by choosing Apple menu > Restart.
• Disconnect any peripheral devices you just connected (for example, a printer). They may not be compatible with your version of macOS.
• Uninstall any app plug-ins or enhancements from other manufacturers.
• If you recently updated the app or macOS, a plug-in or enhancement you installed may no longer be compatible.
• Diagnose problems with your Mac to learn whether hardware you installed, such as additional memory, is incompatible, improperly installed, or defective.
• Worst case scenario - Reinstall macOS. It reinstalls the operating system and leaves everything else alone. I believe it will reinstall the app store and other built-in apps as well.