invalid aapt version

[daoxiangcun]

I build this sample with android studio 1.4, and android sdk build tools 23.0.1, 23.0.2 both installed, but when build, following error happens:

Exception in thread "stderr" java.lang.RuntimeException: Invalid aapt version, version 21 or above is required
at com.android.builder.png.AaptProcess$ProcessOutputFacade.err(AaptProcess.java:217)
at com.android.utils.GrabProcessOutput$1.run(GrabProcessOutput.java:102)
Exception in thread "png-cruncher_6" java.lang.RuntimeException: Timed out while waiting for slave aapt process, try setting environment variable SLAVE_AAPT_TIMEOUT to a value bigger than 5 seconds
at com.android.builder.png.AaptProcess.waitForReady(AaptProcess.java:104)
at com.android.builder.png.QueuedCruncher$1.creation(QueuedCruncher.java:107)
at com.android.builder.tasks.WorkQueue.run(WorkQueue.java:204)
at java.lang.Thread.run(Thread.java:745)

[bherbst]

As per this StackOverflow post, can you verify that you have version 21 of the Android SDK fully installed and that your support library is up to date?

[bherbst]

Closing due to lack of response.