Not working with android Appcompat

[Inzimam-Tariq]

I'm using android appcompat lib and when I try to add this lib in gradle file under dependencies on sync android studio give an error for support libraries like appcompat, recyclerview etc.
This is what I get on sync

Error:Failed to resolve: com.android.support:appcompat-v7:26.0.0
<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile:E:/Android_Studio_and_SDK/Opencart_android/app/build.gradle">Open File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a>

And this

Error:Failed to resolve: com.android.support:recyclerview-v7:26.0.0
<a href="install.m2.repo">Install Repository and sync project</a><br><a href="openFile:E:/Android_Studio_and_SDK/Opencart_android/app/build.gradle">Open File</a><br><a href="open.dependency.in.project.structure">Show in Project Structure dialog</a>

But when I remove this lib (DiscreteScrollView) everything is work fine as usual. I tried more than once.
I'm using

1. Android studio 2.3.3

2. gradle-3.3

3. Java 8

[yarolegovich]

Either install a repository, as advised in the error message, or provide all library's dependencies of your preferred versions and use:

compile ('com.yarolegovich:discrete-scrollview:1.3.0') {
   transitive = false
   //or
   exclude group: 'com.android.support'
}