Gradle build failed - Unresolved dependencies

[hpardess]

I am trying to build this project but it fails with with following log:

A problem occurred configuring project ':app'.

Could not resolve all dependencies for configuration ':app:_debugApkCopy'.
Could not find any matches for com.android.support:appcompat-v7:26.+ as no versions of com.android.support:appcompat-v7 are available.
Required by:
project :app
Could not find any matches for com.android.support:design:26.+ as no versions of com.android.support:design are available.
Required by:
project :app
Could not find any matches for com.android.support:cardview-v7:26.+ as no versions of com.android.support:cardview-v7 are available.
Required by:
project :app
Could not find com.android.support:support-annotations:25.3.0.
Required by:
project :app > com.jakewharton:butterknife:8.8.1
project :app > com.jakewharton:butterknife:8.8.1 > com.jakewharton:butterknife-annotations:8.8.1
Could not find com.android.support:support-compat:25.3.0.
Required by:
project :app > com.jakewharton:butterknife:8.8.1
Could not find com.android.support:support-v4:25.3.1.
Required by:
project :app > me.dm7.barcodescanner:zxing:1.9.8 > me.dm7.barcodescanner:core:1.9.8

And hear is my enviroument:
macOS Hight Sierra
Android Studio v3.6.3

[saikiran-chatti]

Same issue.