Android – I can’t generate a signed apk

I want to update my application, but when I try to generate a signed APK, I receive the following error message:

Please help!!

resolvent:

Try multidexenabled true like this:

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"

        multiDexEnabled true
    }
}

packagingOptions {
    exclude 'Meta-INF/DEPENDENCIES'
    exclude 'Meta-INF/NOTICE'
    exclude 'Meta-INF/LICENSE'
    exclude 'Meta-INF/license.txt'
    exclude 'Meta-INF/notice.txt'
}