This typically occurs when another program such as your backup or antivirus program is accessing the file at the same time that WinMORE tries to access it. Per MCA Technology Requirements (WinMORE and NetMORE), any backup programs should be set to backup after hours, not when you are actively working on your computer, and the antivirus program should have an exclusion for WinMORE and be set to scan after hours as well.