gradle - failed to build tool version android -
    i tried open old project of mine in freshly installed android studio (today), gave me error :   failed find build tools revision 23.0.0 rc2 install build tools 23.0.0 rc2 , sync project   i looked in internet , tried add in gradle file :   android { compilesdkversion 22 buildtoolsversion "22.0.0" }   and gave me error:   gradle dsl method not found: 'android()' possible causes: project may using version of gradle not contain method. gradle settings. build file may missing gradle plugin. apply gradle plugin.   this gradle file :   // top-level build file can add configuration options common sub-projects/modules. buildscript { repositories {     jcenter() } dependencies {     classpath 'com.android.tools.build:gradle:1.2.3'   } }  allprojects { repositories {     jcenter()   } } android { compilesdkversion 22 buildtoolsversion "22.0.0" }          right click on project > open module settings > properties tab, change :   compile sdk verion api...