Fixed - dependency conflict in build.gradle file.

app/build.gradle

@@ -94,7 +94,10 @@ dependencies {
     implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
     implementation 'com.squareup.okhttp3:logging-interceptor:3.8.1'
     implementation 'com.jakewharton:butterknife:8.8.1'
-    implementation 'com.google.android.gms:play-services-analytics:15.0.2'
+    implementation ('com.google.android.gms:play-services-analytics:15.0.2') {
+        exclude group: 'com.google.firebase', module: 'firebase-iid'
+    }
+
     implementation 'com.googlecode.android-query:android-query:0.25.9'
     annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
     implementation('com.crashlytics.sdk.android:crashlytics:2.9.0@aar') {
@@ -108,8 +111,11 @@ dependencies {
     implementation 'com.android.support:animated-vector-drawable:27.1.1'
     implementation 'com.android.support:support-media-compat:27.1.1'
     implementation 'com.android.support:support-v4:27.1.1'
-    implementation 'com.google.firebase:firebase-messaging:15.0.2'
-    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
+    implementation ('com.google.firebase:firebase-messaging:15.0.2') {
+        exclude group: 'com.google.firebase', module: 'firebase-iid'
+    }
+
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
 
     //static Reports Screen
     implementation 'com.numetriclabz.numandroidcharts:numandroidcharts:1.0.9'