android - Error converting bytecode to dex whilte running in real device -


i updated kolin version 1.1.4-2 , start running project in real device it's showing error ->

error message

module:app build.gradle file add last time targetcompatibility in dependency it's not work @ all. whenever run in device it's showing above error->

apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions'  android {     compilesdkversion 26     buildtoolsversion "26.0.1"     defaultconfig {         applicationid "com.company.projectname"         minsdkversion 17         targetsdkversion 26         versioncode 2         versionname "1.1"         testinstrumentationrunner "android.support.test.runner.androidjunitrunner"     }     buildtypes {         release {             minifyenabled false             proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  dependencies {     compile filetree(include: ['*.jar'], dir: 'libs')     androidtestcompile('com.android.support.test.espresso:espresso-core:2.2.2', {         exclude group: 'com.android.support', module: 'support-annotations'     })     compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"     compile 'com.android.support:appcompat-v7:26.+'     compile 'com.google.android.gms:play-services-ads:11.0.4'     compile 'com.android.support.constraint:constraint-layout:1.0.2'     testcompile 'junit:junit:4.12' }

project build.gradle file -> 

// top-level build file can add configuration options common sub-projects/modules.  buildscript {     ext.kotlin_version = '1.1.4-2'     repositories {         jcenter()     }     dependencies {         classpath 'com.android.tools.build:gradle:2.3.3'         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"         // note: not place application dependencies here; belong         // in individual module build.gradle files     } }  apply plugin: 'kotlin'  allprojects {     repositories {         jcenter()     } }  repositories {     mavencentral() } compilekotlin {     kotlinoptions {         jvmtarget = "1.8"     } } compiletestkotlin {     kotlinoptions {         jvmtarget = "1.8"     } }

please tell me how solve it.

the error tells change target , source compatibilities 1.7 in library's sub-module. why can't change that?

i think asks change this:

compilekotlin { kotlinoptions {     jvmtarget = "1.8" } } compiletestkotlin { kotlinoptions {     jvmtarget = "1.8" } }

to this:

compilekotlin { kotlinoptions {     jvmtarget = "1.7" } } compiletestkotlin { kotlinoptions {     jvmtarget = "1.7" } }

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