I had an issue when transferring from Lightroom to Photoshop so contacted the online chat. After an hour of conversation and being transferred I was left with the 'unable to locate' error messages. this after i'd given access to them to resolve and update. the solution is to individually relocate and I'mport or delete and re-instate. Not all the photos I've editing have been exported!
But hey, they apologised for the inconvenience so that makes it all ok.