I am using lightroom 6.2.1 and OS X 10.11. Lightroom will show the previews, but will not import the files. The error says that it cannot read the files which are jpg and CR2 files. Photos is able to import both file types without any problem. When I import to Photos and then export to the desktop, lightroom still gives me the same error and says that it cannot read the jpg files exported to the desktop from Photos. Both lightroom and OS X10.11 are updated. Anyone else having the same difficulty? Any solutions? Thanks.
Also please make sure that the Destination panel on the Right (in Import Window) is expanded and is set to a Valid location(to which you have Full Read and write permissions)
Let us know if that helps
Thanks for the help. Finally switch to a new external drive. For some reason I can no longer write to the previous drive even though there is plenty of storage and lightroom reads from it without error. I do not want to reformat the drive because I will lose the data. Thanks again.