Hey there @George1905,
Thanks for reaching out to us about this - we'll be glad to help you out here.
If you can't listen to your Liked Songs offline we suggest running a clean reinstall of the Spotify app on your mobile device. This will remove corrupted data from previous installations that could be causing the issue. Make sure you restart the connection as well.
In case this persists after the clean reinstall, send us a screenshot of the error message you get. Just attach the image to your next response to us by using the Insert Photos option in the post editor. This way we can take a closer look at the issue.
Hope this helps. Keep us posted.