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Running android app problem : E/AndroidRuntime: FATAL EXCEPTION: main

I get the next message from logcat afyter trying to run my app in andorid studio:
5545-5545/com.example.reyesdelafter E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.reyesdelafter, PID: 5545
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.reyesdelafter/com.example.reyesdelafter.MainActivity}: java.lang.InstantiationException: java.lang.Class cannot be instantiated
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2567)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: java.lang.InstantiationException: java.lang.Class cannot be instantiated
at java.lang.Class.newInstance(Native Method)
at android.app.Instrumentation.newActivity(Instrumentation.java:1078)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2557)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6119) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 
Also y get the message: "E/art: Failed sending reply to debugger: Broken pipe" before that, my code is exactly the same as in the beginning (and it runned well in the emulator, but I do some tries to change the icons of bottom nav view, and some other things but I get back everything to normality (or so I thought ) and it does not run properly. What is the possible problem ? I alredy tried to uprgrade SDK tools, and make sure my Manifest.xml includes my main activity.
The app has just the splash screen and login with Firebase alredy well done and it runned well before that. Thanks

Unity export does not work with android after unity version is upgraded

Old Unity version: 2018.1.6f1
New Unity Version : 2019 versions
I am working on an unity android project and everything is working fine. I recently generated exports from latest unity versions of 2019 but it does not work. I get ResourceNotFound Exception in android. The same export works if generated from old unity version.
I have tried upgrading android studio, but it does not seem to help. Is there any changes needs to be done in Android studio to make it work with latest unity version exports? Or is there any changes needs to be done in Unity while generating exports?
I have attached the logs below:
--------- beginning of crash
05-16 09:30:06.465 4495-4495/com.mytest.package E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.mytest.package, PID: 4495
java.lang.Error: FATAL EXCEPTION [main]
Unity version : 2018.3.14f1
Device model : EPSON EMBT3C
Device fingerprint: MOVERIO/embt3c/cht_cr_rvp:5.1.1/R1.4.0/H75607131158:user/release-keys
Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mytest.package/com.mytest.package.activity.UnityPlayerActivity}: android.content.res.Resources$NotFoundException: String resource ID #0x0
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5258)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x0
at android.content.res.Resources.getText(Resources.java:299)
at android.content.res.Resources.getString(Resources.java:385)
at com.unity3d.player.UnityPlayer.a(Unknown Source)
at com.unity3d.player.UnityPlayer.<init>(Unknown Source)
at com.mytest.package.activity.UnityPlayerActivity.onCreate(UnityPlayerActivity.java:38)
at android.app.Activity.performCreate(Activity.java:5994)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387) 
at android.app.ActivityThread.access$800(ActivityThread.java:151) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:135) 
at android.app.ActivityThread.main(ActivityThread.java:5258) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
05-16 09:30:06.776 4495-4495/com.mytest.package I/Process: Sending signal. PID: 4495 SIG: 9

Firebase chat message is not working

I am trying to run Firebase chat message sample app, but I am getting error due to fire base lib.
The below lib which I have used on my application and referral link
compile 'com.firebase:firebase-client-android:2.5.2+'
https://www.androidtutorialpoint.com/firebase/real-time-android-chat-application-using-firebase-tutorial/
FATAL EXCEPTION: main
Process: sliderlayout.rrd.com.firebasechatmessaging, PID: 22131
java.lang.RuntimeException: Unable to start activity ComponentInfo{sliderlayout.rrd.com.firebasechatmessaging/sliderlayout.rrd.com.firebasechatmessaging.Register}: java.lang.RuntimeException: Android classes not found. Are you using the firebase-client-android artifact?
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2984)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3045)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386)
Caused by: java.lang.RuntimeException: Android classes not found. Are you using the firebase-client-android artifact?
at com.firebase.client.core.Context.setAndroidContext(Context.java:66)
at com.firebase.client.Firebase.setAndroidContext(Firebase.java:974)
at sliderlayout.rrd.com.firebasechatmessaging.Register.onCreate(Register.java:44)
at android.app.Activity.performCreate(Activity.java:6955)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2927)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3045) 
at android.app.ActivityThread.-wrap14(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6776) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1496) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1386) 

Caused by: java.lang.RuntimeException: Android classes not found. Are
you using the firebase-client-android artifact?
because It happens because this version:
compile 'com.firebase:firebase-client-android:2.5.2+'
You can use one of these:
compile 'com.firebase:firebase-client-android:2.4.0'
compile 'com.firebase:firebase-client-android:2.3.1'
compile 'com.firebase:firebase-client-android:2.3.0'
Hope it will help you!!

Application crashes when run on other devices

I'm having a problem with Android Studio and testing my application. I'm testing it on two identical One Plus One devices. It works fine on the one I've been using since the start, but today I tested it on the second device and it crashes when it gets to a certain part of the app.
The app in question connects two or more devices using Google Play services real time multiplayer. One the first device, it's searching for peers to play with. The second device was to test that they can connect.
However, when the button is clicked to search for devices, it crashes the app.
I will print the logs below, but I'm wondering is there some other reason why this happens? Why it works on the device I've used from the start, but doesn't on the exact same device?
Any help is GREATLY appreciated. It's really hindering my progress and Google hasn't returned much in the line of helpful results.
Logs:
03-30 17:21:49.330 10436-10436/com.example.anna.pokerapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.anna.pokerapp, PID: 10436
Theme: themes:{default=overlay:system, iconPack:system, fontPkg:system, com.android.systemui=overlay:system, com.android.systemui.navbar=overlay:system}
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:5204)
at android.view.View$PerformClick.run(View.java:21158)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5461)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:5204) 
at android.view.View$PerformClick.run(View.java:21158) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5461) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 
Caused by: java.lang.IllegalStateException: GoogleApiClient must be connected.
at com.google.android.gms.common.internal.zzac.zza(Unknown Source)
at com.google.android.gms.games.Games.zzb(Unknown Source)
at com.google.android.gms.games.Games.zzi(Unknown Source)
at com.google.android.gms.games.internal.api.RealTimeMultiplayerImpl.getSelectOpponentsIntent(Unknown Source)
at com.example.anna.pokerapp.QuickGame.onStartMatchClicked(QuickGame.java:50)
at java.lang.reflect.Method.invoke(Native Method) 
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
at android.view.View.performClick(View.java:5204) 
at android.view.View$PerformClick.run(View.java:21158) 
at android.os.Handler.handleCallback(Handler.java:739) 
at android.os.Handler.dispatchMessage(Handler.java:95) 
at android.os.Looper.loop(Looper.java:148) 
at android.app.ActivityThread.main(ActivityThread.java:5461) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 

Error on getting Realtime Database reference in service

I am getting error:
06-24 10:41:36.497 17316-17316/com.example.waseem.geolocation:location_service E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.waseem.geolocation:location_service, PID: 17316
java.lang.RuntimeException: Unable to instantiate service com.example.waseem.geolocation.LocationService: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist.
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3085)
at android.app.ActivityThread.access$1900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1505)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5832)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
Caused by: java.lang.IllegalStateException: FirebaseApp with name [DEFAULT] doesn't exist.
at com.google.firebase.FirebaseApp.getInstance(Unknown Source)
at com.google.firebase.FirebaseApp.getInstance(Unknown Source)
at com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source)
at com.example.waseem.geolocation.LocationService.(LocationService.java:34)
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.Class.newInstance(Class.java:1650)
at android.app.ActivityThread.handleCreateService(ActivityThread.java:3082)
at android.app.ActivityThread.access$1900(ActivityThread.java:172) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1505) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:145) 
at android.app.ActivityThread.main(ActivityThread.java:5832) 
at java.lang.reflect.Method.invoke(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:372) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194) `.
on
DatabaseReference mDatabase = FirebaseDatabase.getInstance().getReference();
statement in service but its works fine in activity.

I Found my problem solution by myself and the issue is I am getting this error because I am running my service in different process that define in manifest where I declare my service:
android:process = "......"
when I removed it and now my service is running on application main process and I am not getting any error and its works fine.