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I am getting this error:

Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/util/Function; 

Here is the full output:

2018-11-09 18:33:22.546 24224-24224/com.test.notes.notes E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.test.notes.notes, PID: 24224
 java.lang.RuntimeException: Internal error in Firestore (0.6.6-dev).
 at com.google.android.gms.internal.firebase-firestore.zzkj.run(Unknown Source)
 at android.os.Handler.handleCallback(Handler.java:751)
 at android.os.Handler.dispatchMessage(Handler.java:95)
 at android.os.Looper.loop(Looper.java:241)
 at android.app.ActivityThread.main(ActivityThread.java:6274)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
 Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/util/Function;
 at com.google.android.gms.internal.firebase-firestore.zzfu.zzd(Unknown Source)
 at com.google.android.gms.internal.firebase-firestore.zzeg.<init>(Unknown Source)
 at com.google.android.gms.internal.firebase-firestore.zzcj.zza(Unknown Source)
 at com.google.android.gms.internal.firebase-firestore.zzcl.run(Unknown Source)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)
 at java.util.concurrent.FutureTask.run(FutureTask.java:237)
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:272)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
 at com.google.android.gms.internal.firebase-firestore.zzkg$zza.run(Unknown Source)
 at java.lang.Thread.run(Thread.java:761)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.common.util.Function" on path: DexPathList[[zip file "/data/app/com.test.notes.notes-1/base.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_dependencies_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_0_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_1_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_2_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_3_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_4_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_5_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_6_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_7_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_8_apk.apk", zip file "/data/app/com.test.notes.notes-1/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.test.notes.notes-1/lib/arm64, /system/lib64, /vendor/lib64]]
 at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
 at com.google.android.gms.internal.firebase-firestore.zzfu.zzd(Unknown Source) 
 at com.google.android.gms.internal.firebase-firestore.zzeg.<init>(Unknown Source) 
 at com.google.android.gms.internal.firebase-firestore.zzcj.zza(Unknown Source) 
 at com.google.android.gms.internal.firebase-firestore.zzcl.run(Unknown Source) 
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428) 
 at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
 at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:272) 
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133) 
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607) 
 at com.google.android.gms.internal.firebase-firestore.zzkg$zza.run(Unknown Source) 
 at java.lang.Thread.run(Thread.java:761) 
 Suppressed: java.io.IOException: No original dex files found for dex location /data/app/com.test.notes.notes-1/split_lib_slice_7_apk.apk
 at dalvik.system.DexFile.openDexFileNative(Native Method)
 at dalvik.system.DexFile.openDexFile(DexFile.java:367)
 at dalvik.system.DexFile.<init>(DexFile.java:112)
 at dalvik.system.DexFile.<init>(DexFile.java:77)
 at dalvik.system.DexPathList.loadDexFile(DexPathList.java:359)
 at dalvik.system.DexPathList.makeElements(DexPathList.java:323)
 at dalvik.system.DexPathList.makeDexElements(DexPathList.java:263)
 at dalvik.system.DexPathList.<init>(DexPathList.java:126)
 at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:48)
 at dalvik.system.PathClassLoader.<init>(PathClassLoader.java:64)
 at com.android.internal.os.PathClassLoaderFactory.createClassLoader(PathClassLoaderFactory.java:43)
 at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:58)
 at android.app.LoadedApk.createOrUpdateClassLoaderLocked(LoadedApk.java:541)
2018-11-09 18:33:22.546 24224-24224/com.test.notes.notes E/AndroidRuntime: at android.app.LoadedApk.getClassLoader(LoadedApk.java:574)
 at android.app.ActivityThread.getTopLevelResources(ActivityThread.java:1900)
 at android.app.LoadedApk.getResources(LoadedApk.java:787)
 at android.app.ContextImpl.<init>(ContextImpl.java:2038)
 at android.app.ContextImpl.createAppContext(ContextImpl.java:1983)
 at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5439)
 at android.app.ActivityThread.-wrap2(ActivityThread.java)
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1576)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:241)
 at android.app.ActivityThread.main(ActivityThread.java:6274)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

And I think my build.gradle is needed so here is my build.gradle(Project: test):

apply plugin: 'com.android.application'
apply plugin: 'io.fabric'

android 
 compileSdkVersion 27
 buildToolsVersion '28.0.3'
 defaultConfig 
 applicationId "com.test.notes.notes"
 minSdkVersion 16
 targetSdkVersion 27
 versionCode 17
 versionName "5.1.0"
 testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 vectorDrawables.useSupportLibrary = true
 
 buildTypes 
 release 
 minifyEnabled false
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 
 
 lintOptions 
 checkReleaseBuilds false
 
 aaptOptions 
 cruncherEnabled = false
 


dependencies 
 implementation fileTree(dir: 'libs', include: ['*.jar'])
 implementation 'com.android.support:appcompat-v7:27.0.2'
 implementation 'com.android.support:design:27.0.2'
 implementation 'com.android.support:cardview-v7:27.0.2'
 implementation 'com.android.support.constraint:constraint-layout:1.1.3'
 implementation 'com.android.support:support-v4:27.0.2'
 implementation 'com.android.support:support-vector-drawable:27.0.2'

 implementation 'com.google.firebase:firebase-firestore:15.0.0'
 implementation 'com.firebaseui:firebase-ui-firestore:3.1.1'

 api 'com.joooonho:selectableroundedimageview:1.0.1'
 api 'com.github.bumptech.glide:glide:3.7.0'

 testImplementation 'junit:junit:4.12'
 androidTestImplementation 'com.android.support.test:runner:1.0.2'
 androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

 api 'com.google.firebase:firebase-core:16.0.5'
 api 'com.google.firebase:firebase-firestore:15.0.0'
 api 'com.google.firebase:firebase-storage:16.0.4'
 api 'com.google.firebase:firebase-auth:16.0.5'

 api 'com.crashlytics.sdk.android:crashlytics:2.9.5'


apply plugin: 'com.google.gms.google-services'

With that error, the app crashes.

I think there could be anything wrong with the firebase SDK, but can't figure it out?

Please help me to fix this. I didn't find a way to fix it, for a long time.:(

EDIT:

After updated everything to the newest version and added:

multiDexEnabled true 

...everything works fine. But now I have the Problem, why I downgraded the versions finally. Please have a look at my question: I don't get a response:
Updating code after firebase 16.0.+ update

When I could fix that everything would be fine.

I see a whole mess of problems in your build.gradle.

The first category of issues is that most of your dependencies are pretty outdated.

• The Android API 27 support libraries are on 27.1.1, not 27.0.2.


• 
  firebase-firestore is on 17.1.2, not 15.0.0.


• 
  firebase-ui-firestore is on 4.2.1, not 2.1.1.


• 
  glide is on 4.8.0, not 3.7.0.

Dependency versions should be up-to-date in general, but absolutely must be up-to-date if they're from Google. Otherwise you run into exactly the type of error you have.

The second problem is that you implement firebase-firestore twice, once with implementation and again with api. Remove one or the other.

A handy tip: if a dependency is highlighted in yellow, that means it's outdated! Click the text, hit Alt+Enter and choose the option to update it to the latest version.