After changing the gradle build file to use gradle build tool 0.8.+,
classpath \'com.android.tools.build:gradle:0.8.+\'
my Android studio
right click your
android studio.app -> show package -> content -> gradle
and see the gradle version. In that folder, now got to your android studio IDE and open your preference and go to
Build, execution -> build tool - > gradle
check the preference there. verify the path of gradle is as content - > .... and last there will be gradle version, see if that matched the gradle version in the content of androidStudio.app
guess this helps someone.