Usually the "locate the file" implies you need to follow these instructions: http://www.computer-darkroom.com/lr2_find_folder/find-folder.html
(although it would help if you quoted the complete unedited word-for-word error message so I don't have to guess what the error message really is)
Usually, there is no need to send the .lrdata.
You can also create smart previews and send those instead of the original RAW photos, these take less space than the RAW photos.
Hi Prasobh allways,
You need to send the SmartPreview.lrdata file along with the Catalogs and preview files.
As the original files are stored in your system and would be offline on your Brother computer but would still be offline if you provide the smart previews file as well.
For more information check the below link:
thanks for the response
When I do the catalogue export, I always mark the box Build/Include smart previews.