(macOS) Help! Lightroom Local Catalog Damaged

Hey, @Alina29926025k742. Welcome to the Lightroom Community. I'll need more info to help you figure this out.

What version of Lightroom & the macOS are you working on? Did Lightroom crash unexpectedly recently? Have you tried moving Lightroom's Library from the Pictures folder to another location?

Try these suggestions if the issues with Lightroom started since a recent update.

• Ensure Lightroom has the required permissions on macOS:https://community.adobe.com/t5/lightroom-classic-discussions/quick-tips-how-to-give-full-disk-access-to-lightroom-classic-on-macos/td-p/12913413 
• Log on to Lightroom Web (https://lightroom.adobe.com) & ensure everything is synced & backed up before you proceed further.
• Choose Go > Go To Folder in the Finder window and type ~/pictures. Locate a bundle named Lightroom Library.lrlibrary.
• Right-click or control-click this bundle and choose Show Package Contents. You'll find a folder inside it with a long cryptic string of numbers and letters (for example: d1a4f88d2b534c7d91022136fd182532). Open that folder.
• In the folder, move out all the files named Managed Catalog.[anything] to the mac's desktop. Also, delete the Previews.db file.
• Launch Lightroom.

Let me know how it goes. Thanks!
Sameer K