Error compiling Android

Note: Frameworks/base/nfc-extras/java/com/android/nfc_extras/nfcadapterextras.java is using an unchecked or unsafe operation.
Note: To learn more, recompile with-xlint:unchecked.
Target Java:send_bug (out/target/common/obj/java_libraries/send_bug_intermediates/classes)
Checking Api:checkapi-last
Checking api:checkapi-current
Host Java:layoutlib (out/host/common/obj/java_libraries/layoutlib_intermediates/classes)
Out/target/common/obj/packaging/public_api.txt:15788:error 3:added class Ihelloservice to the package Android.os
Out/target/common/obj/packaging/public_api.txt:15793:error 3:added class ihelloservice.stub to the package Android.os

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You have tried to change the API from the "What has been previously approved.

To make these errors go away, you have both choices:
1) You can add "@hide" Javadoc comments to the methods, etc. listed in the
Errors above.

2) You can update current.txt by executing the following command:
Make Update-api

To submit the revised current.txt to the main Android repository,
You'll need approval.
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Make: * * [Out/target/common/obj/packaging/checkapi-current-timestamp] Error 38
Make: * * is waiting for unfinished tasks ....
Note: Some of the input files use or overwrite outdated APIs.
Note: To learn more, recompile with-xlint:deprecation.
[Email protected]:/opt/friendlyarm/tiny4412/android/android-4.1.2#

(Personal feeling, it should be because of the error caused by the addition of the old Luo jni layer)

Error compiling Android