Every time I open lightroom I get a pop up message saying "Lightroom encountered an error when reading from its preview cache and needs to quit" and it closes. Ive already tried reinstalling, nothing seems to work. Help please!
Open the folder containing your catalog. In that folder you will find another folder with the extension .lrdata, and you need to delete that folder. After you do that, Lightroom should start normally and will create a new preview cache.