Lightroom starts but then I get "Error reading preview cache. LR needs to quit. Will attempt next time it launches. I restart from scratch and the same thing happens. Help please!
In the same folder that your catalog file is stored in, there is a subfolder whose name ends with Previews.LRDATA. Delete this subfolder whose name ends with Previews.LRDATA. Do not delete anything else.
Thank you so much. Job done!