I can no longer open my Lightroom Classic.

I finally uninstalled Classic and reinstalled it. 

​@Brazilmedic In addition to ​@Sameer K ‘s post: Do you a clean reinstall? If no, try a clean reinstallation by following the steps below:

• Backup all personal data, like templates, presets, catalog(s) etc.
• Uninstall everything cc including preferences,    https://helpx.adobe.com/creative-cloud/help/uninstall-remove-app.html
• Uninstall the cc desktop app,    https://helpx.adobe.com/creative-cloud/help/uninstall-creative-cloud-desktop-app.html
• Clean your computer of CC files with the Adobe Cleaner Tool   http://www.adobe.com/support/contact/cscleanertool.html
• Restart your computer (don't skip this)
• Reinstall the CC desktop app,    https://www.adobe.com/creativecloud/desktop-app.html
• Use the desktop app to install your cc programs/trials
  If you like install older versions of apps see here: Install previous versions of Creative Cloud apps
• Restore your personal data.

If you're unable to install the cc desktop app at this stage, use an administrator account (solution 4 here,    https://helpx.adobe.com/creative-cloud/kb/creative-cloud-missing-damaged.html)

Do you get an error message?

Do you have try to create a new catalog or restore the catalog from a backup. A corrupted catalog can prevent Lightroom from starting.

Hey, @Brazilmedic. Welcome to the Lightroom Community. I’ll help you figure this out. I’ll need more info to help you. 

Did Lightroom close normally the last time it worked, or is this a fresh installation on this machine? Try these steps to get Lightroom to launch:

• Reset Lightroom by holding the OPT/ALT + SHIFT (macOS/Windows) when you launch Lightroom and select 'Yes'.
• Ensure Lightroom Classic has the required permissions on macOS: https://adobe.ly/3DyUws

Let me know how it goes. 

Thanks!
Sameer K

(Type '@' and type my name to mention me when you reply)