[Galaxy S 4 i9505 Original Android Development] corsicanu:
Having the same issue described just above me with CM13 on Note 3 with latest Philz CWM.. I pasted a part of the Multiboot.log. Cheers!

I:Checking for extendedcommand & OpenRecoveryScript...
I:Skipping execution of extendedcommand, file not found...
I:Skipping execution of OpenRecoveryScript, file not found...
I:Checking for recovery lock...
I:Cannot load volume /misc.
I:setting up /data/media(/0) for /sdcard.
I:setting up /data/media(/0) for /sdcard.
Calculating md5sum...
Cancelling md5sum...

-- Installing: /sdcard/Download/cm-13-20151101-UNOFFICIAL-hlte_data-slot-2.zip
Finding update package...
I:Update location: /data/media/0/Download/cm-13-20151101-UNOFFICIAL-hlte_data-slot-2.zip
Opening update package...
Installing update...
[D] Initialized installer for zip file: /data/media/0/Download/cm-13-20151101-UNOFFICIAL-hlte_data-slot-2.zip
[D] [Installer] Initialization stage
__bionic_open_tzdata: couldn't find any tzdata when looking for GMT0!
__bionic_open_tzdata: couldn't find any tzdata when looking for posixrules!
[D] Policy version: 26
[D] Added rule: "allow adbd block_device:blk_file relabelto;"
[D] Added rule: "allow adbd graphics_device:chr_file relabelto;"
[D] Added rule: "allow adbd graphics_device:dir relabelto;"
[D] Added rule: "allow adbd input_device:chr_file relabelto;"
[D] Added rule: "allow adbd input_device:dir relabelto;"
[D] Added rule: "allow adbd rootfs:dir relabelto;"
[D] Added rule: "allow adbd rootfs:file relabelto;"
[D] Added rule: "allow adbd rootfs:lnk_file relabelto;"
[D] Added rule: "allow adbd system_file:file relabelto;"
[D] Added rule: "allow adbd tmpfs:file relabelto;"
[D] Added rule: "allow rootfs tmpfs:filesystem associate;"
[D] Added rule: "allow tmpfs rootfs:filesystem associate;"
[D] [Installer] Chroot creation stage
[MultiBoot] Creating chroot environment[D] Running command: [ mount, /system ]
[D] Running command: [ mount, /cache ]
mount: mounting /dev/block/platform/msm_sdcc.1/by-name/cache on /cache failed: Device or resource busy
[D] Running command: [ mount, /data ]
mount: mounting /dev/block/platform/msm_sdcc.1/by-name/userdata on /data failed: Device or resource busy

[D] [Installer] Environment set up stage
[D] [Installer] Device verification stage
[D] libmbp-mini version: 8.0.0.r1885.g19e23d4
[D] ro.product.device = hltexx
[D] ro.build.product = hlte
[D] ro.patcher.device =
[D] Target device = hlte
[D] Boot block device: /dev/block/platform/msm_sdcc.1/by-name/boot
[D] Recovery block device: /dev/block/platform/msm_sdcc.1/by-name/recovery
[D] System block device: /dev/block/platform/msm_sdcc.1/by-name/system
[D] Copied /dev/block/platform/msm_sdcc.1/by-name/boot to the chroot
[D] Copied /dev/block/mmcblk0p14 to the chroot
[D] Copied /dev/block/platform/msm_sdcc.1/by-name/recovery to the chroot
[D] [Installer] Retrieve install type stage
[V] ROM ID: data-slot-2
[D] [Installer] Chroot set up stage
[MultiBoot] Installing to data-slot-2
[D] Boot partition SHA1sum: f6db4a70eb4b16edc04a2801fa3c808d9bfd3d9e
[MultiBoot] ROM ID: data-slot-2
[V] /chroot/update-binary-tool: xattrs not supported on filesystem
[V] /chroot/default.prop: xattrs not supported on filesystem
[V] /chroot/file_contexts: xattrs not supported on filesystem
[D] [Installer] Filesystem mounting stage
[D] /data/.system.img.tmp: Creating new 2415919104 ext4 image
[D] Running command: [ make_ext4fs, -l, 2415919104, /data/.system.img.tmp ]
[MultiBoot] - /system: /data/multiboot/data-slot-2/system
[D] Assigning /data/.system.img.tmp to loop device /dev/block/loop0
[MultiBoot] - /cache: /cache/multiboot/data-slot-2/cache
[MultiBoot] - /data: /data/multiboot/data-slot-2/data
[MultiBoot] - System is image file: false
[MultiBoot] - Cache is image file: false
[MultiBoot] - Data is image file: false[D] [Installer] Installation stage
[V] /chroot/mb/updater: xattrs not supported on filesystem
[D] update-binary is AROMA: 0
about to run program [/update-binary-tool] with 3 args
[V] update-binary-tool: /system not mounted. Skipping
minzip: Extracted 4 file(s)
about to run program [/update-binary-tool] with 3 args
[D] Assigning /mb/system.img to loop device /dev/block/loop0
[D] update-binary-tool: Mounted /mb/system.img at /system
about to run program [/tmp/install/bin/backuptool.sh] with 2 args

run_program: child exited with status 127
about to run program [/update-binary-tool] with 3 args
[D] update-binary-tool: Unmounted /system
about to run program [/tmp/install/bin/otasigcheck.sh] with 1 args
grep: /tmp/recovery.log: No such file or directory
grep: /tmp/recovery.log: No such file or directory
performing update
blockimg version is 3
maximum stash entries 0
creating stash /cache/recovery/90366e4fa7117d6830dd04f8b09a7469550bb932/
304312320 bytes free on /cache (0 needed)
writing 132194 blocks of new data
[MultiBoot] Copying system to temporary image
[MultiBoot] Running real update-binary
[MultiBoot] Here we go!
Target: 1446266478
Patching system image unconditionally...
zeroing 10671 blocks
not a block device; skipping erase
failed to execute command [erase 16,66050,97792,131586,163328,176961,196096,197122,228864,229987,261632,262658,294400,295523,327168,328194,359936]
Verifying the updated system image...script aborted: system partition has unexpected contents after OTA update
[D] Child exited: 7

[E] /mb/updater returned non-zero exit status
[D] [Installer] Filesystem unmounting stage
[D] Running command: [ /update-binary-tool, unmount, /system ]
[V] update-binary-tool: /system not mounted. Skipping
[D] Running command: [ /update-binary-tool, unmount, /cache ]
[V] update-binary-tool: Ignoring unmount command for /cache
[D] Running command: [ /update-binary-tool, unmount, /data ]
[V] update-binary-tool: Ignoring unmount command for /data
[D] Assigning /data/.system.img.tmp to loop device /dev/block/loop0

system partition has unexpected contents after OTA update
[MultiBoot] Failed to run real update-binary
[MultiBoot] Copying temporary image to system
[D] [Installer] Cleanup stage
[MultiBoot] Failed to flash zip file.
[MultiBoot] Destroying chroot environment[E] Failed to unmount /chroot/system: Invalid argument