Help with building SLIM Nougat for Onyx (OnePlus X)

Sorry for hijacking this thread but I wasn't getting any help when posted in any other section... I am getting the following error, how should I fix it?

Code:

---

including vendor/slim/vendorsetup.sh
build/core/product_config.mk:250: *** _nic.PRODUCTS.[[device/oneplus/onyx/slim.mk]]: "frameworks/native/build/phone-xxhdpi-2048-dalvik-heap.mk" does not exist. Stop.
Device onyx not found. Attempting to retrieve device repository from SlimRoms Github (http://ift.tt/1h1OGdP).
Found repository: device_oneplus_onyx
Checking branch info
Calculated revision: ng7.0
Default revision: android-7.0.0_r1
already exists: device/oneplus/onyx
Traceback (most recent call last):
  File "build/tools/roomservice.py", line 379, in <module>
    main()
  File "build/tools/roomservice.py", line 363, in main
    add_to_manifest(adding, fallback_branch)
  File "build/tools/roomservice.py", line 201, in add_to_manifest
    f = open(custom_local_manifest, 'w')
IOError: [Errno 13] Permission denied: '.repo/local_manifests/slim_manifest.xml'
build/core/product_config.mk:250: *** _nic.PRODUCTS.[[device/oneplus/onyx/slim.mk]]: "frameworks/native/build/phone-xxhdpi-2048-dalvik-heap.mk" does not exist. Stop.
build/core/product_config.mk:250: *** _nic.PRODUCTS.[[device/oneplus/onyx/slim.mk]]: "frameworks/native/build/phone-xxhdpi-2048-dalvik-heap.mk" does not exist. Stop.

** Don't have a product spec for: 'slim_onyx'
** Do you have the right repo manifest?

---

from xda-developers http://ift.tt/2cX0nK9
via IFTTT