not working after changing support library version

[ArchangelXu]

I changed the gradle file in the root dir, like this:
ext {
//Sdk and tools
minSdkVersion = 19
targetSdkVersion = 22
compileSdkVersion = 24
buildToolsVersion = '24'

//App dependencies
supportLibraryVersion = '23.4.0'
butterknife = '7.0.1'
circleimageview = '2.0.0'

}