i'm getting a message "lightroom encountered an error when reading from its preview cache an needs to quit" anyone know why i'm getting this message? please
There is some data corruption in the temporary preview cache.
The easiest thing to do is to delete the cache and let LR rebuild it.
In the folder containing your catalog (*.lrcat) file, there is a subfolder with a similar name ending in "previews.lrdata"; delete this subfolder (but no other file) while LR is not running.