2491437 - Upgrade phase "KX_CPYORG" aborted with severe errors, Source file 'FileName.XX' missing!

• You are performing an upgrade using Software Update Manager (SUM) when you receive following errors in the phase PREP_INPUT_CHECK/KX_CPYORG

    SAPup.log:
    CURRENTPHASE PREP_INPUT_CHECK/KX_CPYORG 
    ...started at 20170614160524
    # Using phase log file 'KX_CPYORG.LOG' 
    ....finished at 20170614160601 with status ABORTED.
    # Error message set: 'Failed to copy 1 files, check 'KX_CPYORG.LOG' for details'

      
    KX_CPYORG.LOG:
    1 ETQ399 Copying files from 'T:\usr\sap\<SID>\SYS\exe\uc\NTAMD64' to 'T:\usr\sap\SUM\abap\exe'
    .
    .
    4EETQ399 Source file 'FileName.XX' missing!
    .
    .
    1 ETQ399 Copied 962 files
    1EETQ399 Last error code set is: Failed to copy 1 files, check 'KX_CPYORG.LOG' for detail
    1EETQ204 Upgrade phase "KX_CPYORG" aborted with severe errors ("20170614160601")    

Target Kernel , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem