I have LR 5.7.1 and in hte middle of syncing with lightroom mobile some pictures have not sync and now showing message " error synching with LR mobile". please explain how to get those pictures to sync.
Go to the website lightroom.adobe.com and see if you can see your images in there ?
If yes that means that images are already synced.
If not, try syncing the images again, by pausing the sync and then starting it again, also please make sure that you have enough space left on your device that has LR mobile on it(If you are using one)