Problem for open LRC

Problem for open LRC

Hello,I used Avalanche to transfer Aperture to Lightroom Classic I couldn't find my albums created on Aperture and so I started creating them again to then make books                                                                        I realized that I was missing photos that were on Mac photo                                                                               So I wanted to import them via Avalanche I only managed to import them by plugging in an external hard drive                                                                                                                                                                           But now if I plug in my external hard drive I see all my photos but none of the ratings, especially the notes made to the photos made on LRC                                                                                                                          And if I'm on my Mac without an external hard drive and I want to go to LRC then I can't open it                     I get this message                                                                                                                                          Lightroom catalog not found Unable to find the catalog at the location (/Volumes/WITHOUT TITRWD/Export Avalanche/Summer 2011 [Converted] [Converted]/Summer 2011 [Converted] [Converted].lrcat).    Do you want to search for an existing catalog or use a default one?                                                              Select another catalog Use the default catalog                                                                                                           To leave     However I would like to find the LRC tree following my aperture transfer and also the modifications and noes of the photos worked on LRC following the transfer of aperture and my work on LRC                                Can YOU help me please    Thank you