我使用的是Dagger 2和proguard，我的一个用户在从PlayStore安装后尝试打开应用时会收到NoClassDefFoundError。他正在使用KitKat，Samsung TabS。我在这里不知所措。可能出现什么问题？
以下是我的依赖项：
compile rootProject.ext.kotlinStdLib
kapt rootProject.ext.dataBindingCompiler
compile rootProject.ext.cardView
compile rootProject.ext.design
compile rootProject.ext.appCompat
compile rootProject.ext.hockeyApp
compile rootProject.ext.rxAndroid
compile rootProject.ext.everNoteJob
compile rootProject.ext.gpsServices
compile rootProject.ext.dagger
kapt rootProject.ext.daggerCompiler
provided rootProject.ext.javax
compile rootProject.ext.retrofit
compile rootProject.ext.retrofitRxJava
compile rootProject.ext.retrofitGson
compile rootProject.ext.okHttp
debugCompile rootProject.ext.okHttpLogger
debugCompile rootProject.ext.leakCanary
compile rootProject.ext.rxJava2
testCompile rootProject.ext.junit
testCompile rootProject.ext.assertj
testCompile rootProject.ext.mockitoKotlin
testCompile rootProject.ext.roboElectric
testCompile rootProject.ext.kotlinStdLib
androidTestCompile rootProject.ext.mockitoKotlin
androidTestCompile rootProject.ext.kotlinReflect
androidTestCompile rootProject.ext.kotlinStdLib
androidTestCompile rootProject.ext.espresso
androidTestCompile rootProject.ext.espressoIntents
androidTestCompile rootProject.ext.espressoTestRunner
androidTestCompile rootProject.ext.findBugs
androidTestCompile rootProject.ext.dexMaker
androidTestCompile rootProject.ext.uiAutomator
他们的版本：
buildToolsVersion = "25.0.2"
jdkVersion = '1.8'
minSdkVersion = 19
targetSdkVersion = 25
compileSdkVersion = 25
kotlinStdLib = "org.jetbrains.kotlin:kotlin-stdlib-jre7:${kotlin_version}"
kotlinReflect = "org.jetbrains.kotlin:kotlin-reflect:${kotlin_version}"
androidSupportVersion = '25.4.0'
daggerVersion = '2.9'
hockeyApp = "net.hockeyapp.android:HockeySDK:4.1.3"
appCompat = "com.android.support:appcompat-v7:${androidSupportVersion}"
design = "com.android.support:design:${androidSupportVersion}"
cardView = "com.android.support:cardview-v7:${androidSupportVersion}"
dagger = "com.google.dagger:dagger:${daggerVersion}"
daggerCompiler = "com.google.dagger:dagger-compiler:${daggerVersion}"
rxAndroid = "io.reactivex.rxjava2:rxandroid:2.0.1"
javax = "javax.annotation:jsr250-api:1.0"
dataBindingCompiler = "com.android.databinding:compiler:$gradle_plugin_version"
threeTenAbp = "com.jakewharton.threetenabp:threetenabp:1.0.5"
everNoteJob = "com.evernote:android-job:1.1.11"
gpsServices = "com.google.android.gms:play-services-gcm:11.0.1"
leakCanary = "com.squareup.leakcanary:leakcanary-android:1.5.1"
retrofitVersion = '2.2.0'
okhttpVersion = '3.7.0'
retrofit = "com.squareup.retrofit2:retrofit:${retrofitVersion}"
retrofitRxJava = "com.squareup.retrofit2:adapter-rxjava2:${retrofitVersion}"
retrofitGson = "com.squareup.retrofit2:converter-gson:${retrofitVersion}"
okHttp = "com.squareup.okhttp3:okhttp:${okhttpVersion}"
okHttpLogger = "com.squareup.okhttp3:logging-interceptor:${okhttpVersion}"
rxJava2 = "io.reactivex.rxjava2:rxjava:2.1.0"
powerMockVersion = '2.0.0-beta.5'
junit = "junit:junit:4.12"
mockitoKotlin = "com.nhaarman:mockito-kotlin:1.5.0"
assertj = "org.assertj:assertj-core:3.6.2"
roboElectric = "org.robolectric:robolectric:3.3.2"
espresso = "com.android.support.test.espresso:espresso-core:3.0.1"
espressoIntents = "com.android.support.test.espresso:espresso-intents:3.0.1"
espressoIdler = "com.android.support.test.espresso.idling:idling-concurrent:3.0.0"
espressoTestRunner = "com.android.support.test:runner:1.0.1"
dexMaker = "com.linkedin.dexmaker:dexmaker-mockito:2.2.0"
uiAutomator = "com.android.support.test.uiautomator:uiautomator-v18:2.1.3"
findBugs = "com.google.code.findbugs:jsr305:3.0.2"
我在这里做错了什么吗？