Error: Eclipse not working with this message in console"Cannot run aapt"

Question

When i open my eclipse it shows this error in my Console.

Description Resource Path Location Type Error executing aapt: Cannot run program "/home/amar/android/android-sdk-linux/build-tools/21.1.2/aapt": error=13, Permission denied: error=13, Permission denied DevsmartAndroid line 1 Android ADT Problem

Please help me out.