Sure, I can help you with that. Here are some steps you can follow to fix the YouTube playlist not working error:

1. Clear Browser Cache and Cookies: Sometimes, the problem might be with your browser. Clearing the cache and cookies can help. Here's how:

a. On Chrome: Click on the three-dot menu > More tools > Clear browsing data. Choose the time range and the type of data you want to delete, then click Clear data.

b. On Firefox: Click on the menu button > Options > Privacy & Security > Cookies and Site Data > Clear Data.

2. Update Your Browser: An outdated browser can cause problems with YouTube playlists. Make sure you're using the latest version of your browser.

3. Disable Extensions: Some browser extensions may interfere with YouTube. Try disabling them one by one to see if one of them is causing the problem.

4. Check for Updates: Make sure your device is up-to-date. If you're using a mobile device, check for app updates in the App Store (for iOS) or Google Play Store (for Android).

5. Log Out and Log In Again: Sometimes, simply logging out of your YouTube account and logging back in can fix the issue.

6. Use Another Device: If none of the above steps work, try accessing the playlist from another device. This can help you determine if the problem is with your device or with YouTube itself.

Remember, if a specific video in the playlist has been deleted or made private, you won't be able to play it. If this is the case, remove the video from the playlist.