What happens when you move those images to a different location and then reimport them to Lightroom?
This issue happens when there are issues with permissions to the drive containing your images.
The problem is that I have no idea which images are the culprits. The E: drive on my desktop computer is the CD/DVD drive and there is no disk in it. In LR, the E: drive is not listed in the folders panel either so I'm at a lose as to how to figure out which 2 images are causing the problem.
Hi Akash, Thanks for looking into this. The Preferences screen shows 0 sync activity but the Active Processes screen (down arrow next to Identity Plate) shows 2 photos being sync'ed. I'm including 4 screen shots.
1) warning that it can't write to the E drive when I launch LR
2) The active processes list showing 2 images being sync'd
3) The LR Mobile preferences showing 0 images being sync'd
4) Warning pop up when I exit LR
Problem solved. I had been running CC/2015.6 and per the instructions on the link you provided, I upgraded to Cc/2015.10. This in itself did not solve the problem, but in the newer version when I looked at the preferences screen it now showed entries for the two images. I clicked on each one, which launched LR on the Web and I discovered that these two photos were taken with my smart phone. While on that screen, I noticed something I hadn't noticed before. There was a checkbox in the "Location" section called "Specify Location for Lightroom Mobile images" that was checked and the path was pointing to the mythical "E:" drive. So I changed the path to my "P:" drive, at which time the two images sync'd and all is back to normal.
Thank you for your help. I must have looked at that screen 10 times without noticing that path.
I am glad to know the issue is resolved.