Trying to build Pixel Experience Getting Can not assign readonly variable erroor

[Larson Carter]

Hello all. Does anyone have a clue on how to fix this?

larsoncarter@larson-ubuntu:~/pixelexperience$ lunch aosp_fajita-userdebug
vendor/pixelstyle/config.mk:48: warning: "PixelStyle: TARGET_BOOT_ANIMATION_RES is undefined, assuming 1080p"
device/oneplus/fajita/BoardConfig.mk:67: error: cannot assign to readonly variable: PRODUCT_COMPATIBLE_PROPERTY_OVERRIDE
18:17:03 dumpvars failed with: exit status 1
Device fajita not found. Attempting to retrieve device repository from PixelExperience-Devices Github (http://github.com/PixelExperience-Devices).
Found repository: device_oneplus_fajita
Checking branch info
Calculated revision: ten
Branches found:
pie
Use the ROOMSERVICE_BRANCHES environment variable to specify a list of fallback branches.
vendor/pixelstyle/config.mk:48: warning: "PixelStyle: TARGET_BOOT_ANIMATION_RES is undefined, assuming 1080p"
device/oneplus/fajita/BoardConfig.mk:67: error: cannot assign to readonly variable: PRODUCT_COMPATIBLE_PROPERTY_OVERRIDE
18:17:04 dumpvars failed with: exit status 1
vendor/pixelstyle/config.mk:48: warning: "PixelStyle: TARGET_BOOT_ANIMATION_RES is undefined, assuming 1080p"
device/oneplus/fajita/BoardConfig.mk:67: error: cannot assign to readonly variable: PRODUCT_COMPATIBLE_PROPERTY_OVERRIDE
18:17:05 dumpvars failed with: exit status 1

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