Backup stops in Skydrives pictures

My backup seems to stop every time on picture files from Skydrive:

Error code: 3
Module: 4
LineInfo: ce542e14da20399b
Fields: Path : C:/Users/***/SkyDrive/Documents/IlvesJaKarhu.jpg, $module : disk_bundle_vs_39029
Message:
--------------------
Error code: 2
Module: 4
LineInfo: d18a9c757ef132f0
Fields: $module : disk_bundle_vs_39029
Message: The end of the file has been reached.
--------------------

This is Win8.1 (64b).

I noticed that I can solve by deleting the *.jpg files in that folder, but I really do not quite understand why this happens.