When I open lightroom it's saying the catalog can not be found. I changed the name of my catalog today in a college class I'm taking. Everything is on an external hard drive. Nothing has changed except for renaming, but I can't open it now .
Open the file manager for your OS and go to the external drive then then folder the catalog is in. Double click on the catalog you renamed.
LR is looking for the old name of the catalog that you renamed.
Don't do that again.
Retrieving data ...