problème d'exécution en Android studio

Exception in thread "png-cruncher_40" java.lang.RuntimeException: Timed out while waiting for slave aapt process,
make sure the aapt execute at C:\Users\moumen\AppData\Local\Android\Sdk\build-tools\23.0.3\aapt.exe can run successfully (some anti-virus may block it) or try setting environment variable SLAVE_AAPT_TIMEOUT to a value bigger than 5 seconds
at com.android.builder.png.AaptProcess.waitForReady(AaptProcess.java:108)
at com.android.builder.png.QueuedCruncher$1.creation(QueuedCruncher.java:110)
at com.android.builder.tasks.WorkQueue.run(WorkQueue.java:203)
at java.lang.Thread.run(Thread.java:745)**



comment résoudre cette erreur:)
merci:):P