Could not find manifest-merger.jar (com.android.tools.build:manifest-merger:26.0.1)

I finally fixed the issue. This may be a workaround but it works.So if anyone having this issue, just follow this:

1. Swap the position of jcenter() and google() in project gradle file and in also all the other module you have in your project. Like in mine I have crashlytics, fabric so just remember to make the changes in their build.gradle file as well:

   buildscript {    repositories {        jcenter()        google()    }}

   to

   buildscript {    repositories {        google()        jcenter()    }}

2. Before building your project again go to your project folder and delete the .gradle folder from your project and then build your project.

1. Go to Publishing Settings/Build, enable Custom Gradle Template
2. Go to Assets/Plugins/Android/mainTemplate.gradle and change the postion from

  buildscript {    repositories {        jcenter()        google()}

to

 buildscript {   repositories {      google()      jcenter()}

3. Remove gradle cache and rebuild. For Mac you can run rm -rf $HOME/.gradle/caches/ in terminal.

Jcenter no longer hosts google dependencies, these can be resolved from "https://maven.google.com"so you can simply add that to the resolvers list along with jcenter.

Regards,Itamar