[ZenFone 2 Original Android Development] espeon:
I actually just bothered to look at the local manifest on github; I think that around the time the zenfone's stuff got moved around the repo that's erroring for you got renamed to android_hardware_intel_common_libmix. Try replacing your local manifest with this:

<?xml version="1.0" encoding="UTF-8"?>
<manifest>

<remote name="cm-zf2"
fetch="https://github.com/CM-zenfone2"
revision="cm-12.1" />

<remote name="cyanogenmod"
fetch="https://github.com/CyanogenMod"
revision="cm-12.1" />

<remote name="muppet"
fetch="https://github.com/TheMuppets"
revision="cm-12.1" />

<remote name="joelmaxuel"
fetch="git://github.com/joelmaxuel"
revision="cm-12.1" />

<remote name="joelmaxuel-caf"
fetch="git://github.com/joelmaxuel"
revision="cm-12.1-caf" />

<remote name="joelmaxuel-lp"
fetch="git://github.com/joelmaxuel"
revision="lp5.1.1" />

<!-- REMOVE AOSP PROJECTS -->
<remove-project name="CyanogenMod/android_hardware_intel_common_libmix" path="hardware/intel/common/libmix" />
<remove-project name="CyanogenMod/android_hardware_intel_img_hwcomposer" path="hardware/intel/img/hwcomposer" />
<remove-project name="CyanogenMod/platform_hardware_intel_img_libdrm" path="hardware/intel/img/libdrm" />

<remove-project name="CyanogenMod/android_hardware_ril" path="hardware/ril" />
<remove-project name="CyanogenMod/android_system_core" path="system/core" />
<remove-project name="CyanogenMod/android_bootable_recovery" path="bootable/recovery" />
<remove-project name="CyanogenMod/android_external_tinyalsa" path="external/tinyalsa" />
<remove-project name="CyanogenMod/android_frameworks_native" path="frameworks/native" />
<remove-project name="CarbonROM/android_frameworks_base" path="frameworks/base" />

<!-- ADD CM-ZENFONE2 PROJECTS -->
<project name="android_hardware_intel_common_libmix" path="hardware/intel/common/libmix" remote="joelmaxuel" />
<project name="android_hardware_intel_img_hwcomposer" path="hardware/intel/img/hwcomposer" remote="joelmaxuel" />
<project name="android_hardware_intel_img_libdrm" path="hardware/intel/img/libdrm" remote="joelmaxuel" />

<project name="android_hardware_ril" path="hardware/ril" remote="joelmaxuel" />
<project name="android_hardware_ril" path="hardware/ril-caf" remote="joelmaxuel-caf" />
<project name="android_system_core" path="system/core" remote="joelmaxuel" />
<project name="android_bootable_recovery" path="bootable/recovery" remote="joelmaxuel" />
<project name="android_external_tinyalsa" path="external/tinyalsa" remote="joelmaxuel" />
<project name="android_frameworks_native" path="frameworks/native" remote="joelmaxuel" />
<project name="android_frameworks_base" path="frameworks/base" remote="joelmaxuel-lp" />

<!-- CM-ZENFONE2 DEVICE PROJECTS -->
<project name="android_device_asus_Z00A" path="device/asus/Z00A" remote="cyanogenmod" />
<project name="android_device_asus_mofd-common" path="device/asus/mofd-common" remote="cyanogenmod" />
<project name="android_kernel_asus_moorefield" path="kernel/asus/moorefield" remote="cyanogenmod" />
<project name="proprietary_vendor_asus" path="vendor/asus" remote="muppet" />
</manifest>

This should work. I haven't actually done a repo sync in like a month since there's not really been anything I've needed to pull from upstream so I didn't notice this change.