android - why am i getting errors while attempting to build my signed APK -


i trying create signed apk , saw this tutorial online. followed steps in tutorial , still following error in messages tab .

error : 

error:a problem occurred configuring project ':app'. > not resolve dependencies configuration ':app:_debugcompile'.    > not find com.android.support:appcompat-v7:22.2.0.      searched in following locations:          https://jcenter.bintray.com/com/android/support/appcompat-v7/22.2.0/appcompat-v7-22.2.0.pom          https://jcenter.bintray.com/com/android/support/appcompat-v7/22.2.0/appcompat-v7-22.2.0.jar          file:/c:/users/silambu/appdata/local/android/sdk/extras/android/m2repository/com/android/support/appcompat-v7/22.2.0/appcompat-v7-22.2.0.pom          file:/c:/users/silambu/appdata/local/android/sdk/extras/android/m2repository/com/android/support/appcompat-v7/22.2.0/appcompat-v7-22.2.0.jar          file:/c:/users/silambu/appdata/local/android/sdk/extras/google/m2repository/com/android/support/appcompat-v7/22.2.0/appcompat-v7-22.2.0.pom          file:/c:/users/silambu/appdata/local/android/sdk/extras/google/m2repository/com/android/support/appcompat-v7/22.2.0/appcompat-v7-22.2.0.jar      required by:          droidone:app:unspecified

if don't generate signed apk , android studio does't build project , run it, need build signed apk. why getting error , how solve ?

edit: build gradle files .

apply plugin: 'com.android.application'  android {     compilesdkversion 22     buildtoolsversion "22.0.1"      defaultconfig {         applicationid "com.example.gautam.droidone"         minsdkversion 8         targetsdkversion 22         versioncode 1         versionname "1.0" //        testpackagename "com.example.gautam.droidone.tests.mainactivitytest"     }     buildtypes {         release {             minifyenabled false             proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  dependencies {     compile filetree(dir: 'libs', include: ['*.jar'])     compile 'com.android.support:appcompat-v7:22.2.0' }

other 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'          // note: not place application dependencies here; belong         // in individual module build.gradle files     } }  allprojects {     repositories {         jcenter()     } }


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