Need help resolving a error!

anyone know fix for this?

Code:

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Checking build tools versions...
build/core/package_internal.mk:143: Empty argument supplied to find-subdir-assets
build/core/binary.mk:1220: external/deqp/Android.mk: libdeqp: Unused source files: \
build/core/binary.mk:1220: external/pdfium/third_party/pdfiumbigint.mk: libpdfiumbigint: Unused source files: bigint/BigInteger.cc bigint/BigIntegerUtils.cc bigint/BigUnsigned.cc bigint/BigUnsignedInABase.cc
build/core/package_internal.mk:143: Empty argument supplied to find-subdir-assets
find: '/home/sachin/candy/out/target/common/obj/SHARED_LIBRARIES/libwifi-hal-mock_intermediates': No such file or directory
build/core/base_rules.mk:183: *** hardware/qcom/power: MODULE.TARGET.SHARED_LIBRARIES.power.msm8974 already defined by device/qcom/common/power.
build/core/ninja.mk:163: recipe for target '/home/sachin/candy/out/build-candy_onyx.ninja' failed
make: *** [/home/sachin/candy/out/build-candy_onyx.ninja] Error 1

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Building Candy 7 for OnePlus X

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